The prefix semi is commonly used in the English language to indicate partiality or incompleteness. It is derived from the Latin word “semi,” which means half. The addition of semi to a word can change its meaning, creating new words that are frequently used in everyday language.
The prefix semi- is used to mean “partial” or “somewhat” in words like “semicircle” or “semi-conscious.” Example: “The patient was semi-conscious after the surgery, but still unable to speak.”
In this blog post, we will explore the various meanings and uses of the prefix semi and provide examples of how it can alter the meaning of a word.
You’ll gain a deeper understanding of the prefix semi- and maybe find new ways to use it in your own English conversations. Plus, you can find a free Prefix Semi- Word List PDF download at the end of this post.
Table of Contents
- The Prefix Semi- Meaning
- Prefixes and Hyphens (-)
- The Prefix Semi- Real Examples
- The Prefix Semi- Frequently Asked Questions
- What is the origin of the prefix semi?
- How does the prefix Semi- vary across different languages?
- Prefix Semi- 10-page PDF Word List
The Prefix Semi- Meaning
The prefix semi- is used in adjectives and nouns to mean partly or half. Semi-conscious means partly conscious. A semicircle is half a circle.
semi_2 prefix OxfordLearnersDictionaries.com
Prefixes and Hyphens (-)
How can I tell if my prefix word needs a hyphen or not? That’s a great question, even for native English speakers. Hyphens are things we only need to worry about in written English, in English conversation we can’t see hyphens.
Sometimes we need to send an email so we want to use the correct spelling in our message. Here is a basic guide to using hyphens (-).
According to Grammar Monster:
Most prefixed words can be written with or without a hyphen after the prefix.
SOURCE
So there is some freedom in our choice to use a hyphen or not. Our goal is to communicate our ideas clearly to our conversation partners, here are a few guidelines to help you achieve that goal in your English writing.
- The prefixes- ex- and self- will always use a hyphen.
- Ex-wife – Self-evaluation
https://worldenglishblog.com/how-to-teach-the-prefix-ex/
https://worldenglishblog.com/the-prefix-self/
- Ex-wife – Self-evaluation
- Break up matching vowels. This makes your message clear. This applies to prefixes that end in a vowel like CO- and DE-
- De-escalate – Co-opt
https://worldenglishblog.com/the-prefix-de/
https://worldenglishblog.com/the-prefix-co/
- De-escalate – Co-opt
- If the vowels don’t match we can usually leave out the hyphen
- Deactivate (No hyphen is ok.)
- Be careful if your prefix word looks the exactly the same or similar to another word. Adding a hyphen makes your meaning clear.
- For example re-cover means to cover again – The verb recover means to get well again after being ill, hurt, etc. (Using a hyphen is necessary to make the meaning of your word clear.)
- Still not sure? Trust your spell checker! I use Grammarly. You can download the FREE version here: Grammarly
My choice to write the word with or without a hyphen (-) is random. Both spellings are usually fine.
Semi-annual: occurring twice a year, every six months. (I found examples of semiannual written with and without a hyphen)
・The company’s board meetings are held on a semi-annual basis.
・The company’s budget is reviewed on a semiannual basis.
Semi-arid: a climate or region that receives very little rainfall, but not as little as a desert.
・The semi-arid region is prone to droughts and water scarcity.
Most semi-arid areas usually have very little rainfall throughout the year.
Semi-automatic: a firearm that requires a trigger pull for each round fired, but uses some of the energy from firing to automate reloading.
・The soldier keeps his semi-automatic rifle clean and ready for action.
Semi-detached: a type of housing where two separate dwellings share a common wall.
・The new family moved into the semi-detached house next door.
Semi-final: a competition in which the winners will advance to the final round.
・The team won their semi-final match and advanced to the championship game.
Semi-precious: referring to gems or stones that are not as rare or valuable as precious stones like diamonds.
・She loves to wear jewelry made of semi-precious stones like amethyst and turquoise.
Semi-skilled: having some training or ability in a particular job or trade, but not fully qualified or experienced. (I found examples of semiskilled written with and without a hyphen)
・The company hired semi-skilled workers to perform basic assembly line tasks.
・The construction worker was semiskilled, able to perform basic tasks like framing and roofing but not qualified to do electrical or plumbing work.
Semi-sweet: referring to a taste that is only slightly sweet.
・The dessert had a perfect balance of semi-sweet chocolate and tart cherries.
I like semi-sweet chocolate. Dark chocolate is bitter and milk chocolate is too sweet for me.
Semi-trailer: a type of trailer that is attached to a truck tractor and is designed to carry freight without a front axle.
・The truck driver hitched the semi-trailer to the tractor and set off on the highway.
Semi-tropical: referring to a climate or region that is moderately warm and humid, but not as hot as a tropical climate. (I found examples of semitropical written with and without a hyphen)
・The resort is located in a semi-tropical climate that offers warm weather and cool breezes.
・The region had a semitropical climate, with warm temperatures and occasional tropical storms.
Semi-weekly: occurring twice a week, every other day or twice in a week.
・The newspaper publishes semi-weekly editions on Wednesdays and Saturdays.
Semiautonomous: partially self-governing, having some degree of autonomy but still under the control of a larger entity.
・The city has semiautonomous districts that have some control over their own local affairs.
Semi-basement: a partially below-ground level of a building, with windows above the ground level.
・The storage area in the semi-basement kept the tools and equipment cool and dry.
Semibluff: a poker play in which a player with a weak hand bets as if they have a strong hand, in order to bluff their opponents.
・He made a semibluff with his low pair, hoping to scare his opponent into folding.
If I make a big bet and turn this into a semibluff I might take the pot down now.
Semicircle: a thing, or a group of people or things, like a semicircle in shape
・The teacher had everyone sit in a semicircle while we listened to the story.
Semiconscious: a state of being partially awake or aware.
・The patient was semiconscious after the surgery, but still unable to speak.
Semidependent: partially dependent on someone or something else for support or care.
・ The elderly woman was semidependent on her caregiver for help with daily tasks.
Semidesert: a region that is partially desert, with less extreme conditions than a full desert.
・The semidesert landscape was dotted with cacti and scrub vegetation.
Cacti is an irregular plural form of the noun cactus. Learn more about singular and plural nouns at my blog post: Singular and Plural nouns – 50 examples (worksheet PDF)
Semidiameter: half the diameter of a circle or sphere.
・The semidiameter of the Earth is approximately 3,959 miles. (6,378.1370 km) SOURCE
Semidomesticated: partially tamed or domesticated, but not fully adapted to living with humans.
・The stray cat was semidomesticated, showing signs of having once lived with humans but still wary of being approached.
Semifictional: partially based on real events or people, but with fictional elements added.
・The movie was semifictional, telling the story of a real-life celebrity but embellishing some of the details for dramatic effect.
Semiflexible: partially flexible, able to bend or adapt to some degree but not completely pliable.
・The semiflexible plastic tubing was perfect for use in plumbing, as it could bend around obstacles but still maintain its strength.
Semifluid: partially fluid, having some fluidity but not completely liquid.
・Some of the lower levels of the Earth are made of semifluid liquid rock.
Semiformal: partially formal, having some elements of formality but not completely formal.
・The dress code for the event was semiformal, allowing for some flexibility in attire but still requiring a certain level of dressiness.
We dress semi-formal at the office. A collared shirt without a tie is fine.
Semigloss: partially glossy, having some shine but not completely glossy.
・The walls were painted with a semigloss finish, giving them a slight shine without being too reflective.
Semiofficial: partially official, having some level of authority or recognition but not completely recognized or sanctioned.
・The group had a semiofficial status, with some recognition from the government but was not considered an official organization.
Semipermanent: partially permanent, lasting for an extended period but not intended to be permanent.
・I work at the school on a semipermanent basis.
Semiprivate: partially private, offering some degree of privacy but not completely private.
・The hospital room was semiprivate, shared with one other patient but offering a degree of privacy with a dividing curtain.
I had good travel insurance so I could upgrade from a semiprivate room to a private room.
Semipro / Semiprofessional: a person who is not a full-time professional, but earns money in a particular field on a part-time or occasional basis.
・The soccer team had several semipro players who worked day jobs but played on the weekends.
Semiretired: partially retired, working part-time or on a reduced schedule but not fully retired.
・The consultant was semiretired, working only a few days a week but still advising clients on projects.
Semisolid: partially solid, having some solidity but not completely solid.
・Mayonnaise is a good example of a semisolid. It’s not completely solid but it also doesn’t flow like a liquid.
Semitransparent: partially transparent, allowing some light to pass through but not completely transparent.
・The window film was semitransparent, offering some privacy.
Semivowel: a speech sound that sounds like a vowel but functions as a consonant, for example, /w/ and /j/ in the English words wet and yet
“The words “yes” and “well” start with semivowels.”
QUOTE
Some of the words on this list can be referred to simply as “semi” in conversation. The full word is understood by the context of the story.
- “I used to live in a semi in a suburb of Toronto.”
This means a semi-detached house. - “There was a big accident on the highway, a semi rolled over and caused a huge traffic jam.”
This means a semi-trailer rolled over.
The plural form semis is often used to refer to the semi-final games of a sports tournament.
- If we win tonight we make it to the semis.
The Prefix Semi- Frequently Asked Questions
What is the origin of the prefix semi?
The Prefix Semi- comes from Latin. It’s related to the Greek hemi-.
You may have heard the word hemisphere before, hemisphere is half of the Earth divided at the equator. We have the North and the South hemispheres.
How does the use of the Prefix SEMI vary across different languages?
In English, semi- is a common prefix that is used to indicate partiality or incompleteness.
French often uses the prefix demi- to indicate partiality or incompleteness. For example, “demi-cercle” means half-circle in French, while “demi-finale” means semifinal.
In Spanish, the prefix semi- is often replaced with “medio-” or “mitad de-” to indicate partiality or incompleteness. For example, “medio círculo” means half-circle in Spanish.
In some other languages, such as German, the prefix halb- is used to indicate partiality or incompleteness. For example, “Halbkreis” means half-circle in German.
How about in your language? Share any prefixes that have the same meaning in your language in the comments.
Prefix Semi- 10-page Word List PDF
Download the Word List as a printable PDF. Great for teachers to use with private or group classes. PDF contains the live links from the post.
Check out these other helpful PREFIX and SUFFIX blog posts.
Words with the prefix semi-
The prefixsemi-, of Latin origin, it is used to indicate «intermediate situation», «almost» or «half of something». For example: semicircle (half a circle), semiquaver (half an eighth note).
It is related to the prefix hemi- which also means «half» or «half of», but of Greek origin.
How do you spell the prefix semi-?
Like all prefixes, semi- is written together with the accompanying word and the separation by space or script.
Joined to words that begin with a vowel I
As with the prefix anti-, the prefix semi- ends in a weak vowel: the letter I.
If the word that accompanies the semi- prefix begins with a vowel I, it is correct to duplicate this vowel I, forming a double I (II). For example: semiiInflatable. It is also correct to suppress an I: semiInflatable.
However, the spelling may allow the simplification of one of the vowels I as long as its meaning is not altered. For example: the word semiilegal You could not delete a vowel I since, in this example, it would completely change its meaning:
semiilegal(something that is almost illegal), semilegal (something that is almost legal).
Attached to a word that begins with R
In the event that the semi- prefix accompanies a word that begins with the letter R, it is necessary to duplicate this letter and form a double R (RR). For example: semirrfiery
Examples of words with the prefix semi-
- Semi open: Something that is half open. That is, half open and half closed.
- Semiautomatic: That it is not completely automatic but has certain automatic functions but not all.
- Semi-demeanor: Smooth rise in intonation of a phrase at the end of the phrase.
- Semi-hot: Something that is warm, that is, neither too hot nor cold.
- Semi-tired: That you are partially tired or fatigued.
- Semi-closed: That it is half closed but not completely.
- Half cylinder: Body that is made up of half a circle.
- Semicircle: Half a circle.
- Semicircumference: Half of a circumference.
- Semi-cooked: Something that is not fully cooked.
- Semiconductor: Which conducts partially, less than certain conductors and more than insulators.
- Semiconsonant: Vowel that is located at the beginning of a diphthong.
- Semiquaver: Rhythmic figure that is equal to half an eighth note.
- Semi-covered: Which is partially covered.
- Half naked: Which is partially or moderately naked.
- Half destroyed: Which was partially destroyed.
- Semidiameter: Each of the two parts of a diameter that are separated by the center.
- Semi-deceased: Almost deceased.
- Semi diffuse: Something almost fuzzy.
- Demigod: That he does not become a god.
- Half asleep: That he is partially asleep.
- Semisweet: Which is mildly sweet.
- Hemisphere: Half sphere.
- Semifinal: Instance before a final.
- Semi-fuzzy: It is a rhythmic musical figure that is equal in time to half a fusa.
- Demihuman: That it has human features but that it does not get to be.
- Semi-conscious: That he is almost unconscious.
- Semi-independent: Which is partially independent.
- Semi-inflatable: Object that can be partially inflated.
- Semilunio: Half the time it takes the moon to pass from one conjunction to the other.
- Pre-owned: That it is not completely new, that is to say that it has very little use.
- Medium heavy: Which is moderately heavy.
- Semiplane: Which results from the division by a line that crosses the middle of said plane.
- Semi-professional: That it does not become professional.
- Ray: Which is a partial line.
- Semirigid: That it does not have absolute rigidity.
- Semi dry: That it is moderately dry.
- Semitone: Term used in music that indicates an interval that corresponds to half a tone.
- Semitransparent: Which is partially transparent.
- Semi-alive: Half alive.
(!) Exceptions
Not all words that begin with semi-syllables correspond to this prefix. There are some exceptions:
- Seminar: Group of activities carried out by teachers and students and that revolve around an activity with the aim of instructing them in a specific subject.
- Semiotics: Science that studies the signs.
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Prefix SEMI is widely used to form new words which may convey totally different meanings. A Prefix is placed before a root word to make a new word. ROOT-WORDS are Prefixes HEMI, DEMI & SEMI meaning HALF. Here is the list of words with the Prefix SEMI.
Prefixes Index From Prefix SEMI to HOME PAGE |
What words have the prefix semi?
10-letter words that start with semisemiannual.seminarian.semicircle.semipublic.semiformal.semiweekly.semidesert.semiliquid.
What words start with semi and mean half?
Terms in this set (9)Prefix SEMI. Partial, half.Semicircle. Half of a cirle; half rounded.Semifinal. A game or competition that comes before the final one.Semiconscious. A feeling in which you are not completely aware of your sensations.Semisweet. Semiautomatic. Semidetached. Semitropical.
What is the root word of semi?
semi- a combining form borrowed from Latin, meaning half, freely prefixed to English words of any origin, now sometimes with the senses partially, incompletely, somewhat: semiautomatic; semidetached; semimonthly; semisophisticated.
What are words that have the prefix in?
ExamplesWord= Prefix+ Steminclude= in+ cludeindependent= in+ dependentinvisible= in+ visible
What are the 10 examples of prefix?
10 Examples of PrefixesSub- Definition: under. Example Sentence: He has never seen a blue submarine in the my life.Post- Definition: postgraduate. Auto- Definition: self. Un- Definition: not. Semi- Definition: half. Mis- Definition: Wrong, wrongly. Dis- Definition: Not, opposite of. Re- Definition: Again.
What are the 20 prefixes?
Table of number prefixes in EnglishNumberLatin prefixesGreek prefixesCardinalCardinal18octodec-octo(kai)deca-, decaocto-19novemdec-, novendec-ennea(kai)deca-, decaennea-20viginti-(e)icosi-42
What is the prefix for 10 2?
PrefixesPurposePrefix NameValuesmaller quantities or sub unitsdeci10-1centi10-2milli10-3micro10-618
What are common prefixes?
The most common prefixes used to form new verbs in academic English are: re-, dis-, over-, un-, mis-, out-….Verbs.PrefixMeaningExamplesinter-betweeninteract, intermix, interfacepre-beforepre-expose, prejudge, pretestsub-under/belowsubcontract, subdividetrans-across, overtransform, transcribe, transplant11
How many types of prefixes are there?
(There are almost 50 prefix examples on the Common Prefixes page alone.) The practice exercises show ways to use them in sentences. The Negative Prefix List explains the differences between common negative prefixes.
What are the three types of prefixes?
There are three main types of affixes: prefixes, infixes, and suffixes. A prefix occurs at the beginning of a word or stem (sub-mit, pre-determine, un-willing); a suffix at the end (wonder-ful, depend-ent, act-ion); and an infix occurs in the middle.
What are the examples of prefixes?
The prefixes are: de-, dis-, ex-, im-, in-, mis-, non-, pre-, pro-, re-, un-, and uni-….Prefixes and Suffixes.PrefixMeaningExamplesde-from, down, away, reverse, oppositedecode, decreasedis-not, opposite, reverse, awaydisagree, disappearex-out of, away from, lacking, formerexhale, explosionil-notillegal, illogical8
How many prefixes are there in English?
35 Common Prefixes in English.
What are some good prefixes?
The most common prefixesprefixmeaningexamplesanti-against/opposed toanti-government, anti-racist, anti-warauto-selfautobiography, automobilede-reverse or changede-classify, decontaminate, demotivatedis-reverse or removedisagree, displeasure, disqualify24 •4 days ago
Are all prefixes Derivational?
In English, all prefixes are derivational. This contrasts with English suffixes, which may be either derivational or inflectional.
Is overdo a prefix?
A prefix is a word part added to the beginning of a word. Overwork, overslept, and overdo are all words that have the prefix over- in them.
What is the prefix over?
When you add OVER- at the beginning of a word, it means too much or more than enough. In this lesson, we will look at words beginning with the prefix OVER- , such as overestimate , overhaul , override , overachieve , overkill , overrule , and more.
What overdo means?
1 : to do too much of Don’t overdo it exercising. 2 : to use too much of They overdid the decorations. 3 : to cook too long I overdid the steak.
Is over an affix?
Excessively; extra; outer; above. English over. The form has several of the senses of the preposition over and appears in a very large number of compounds that can be nouns, adjectives, verbs, or adverbs.
What does overburdened mean?
When you give someone too much to carry, you overburden them. I don’t want you to overburden yourself” There’s also a figurative way to overburden another person, by pressuring them or making them work too hard: “If the budget cuts go through and school aides are laid off, it will overburden teachers.” …
Do all words have affixes?
Many new words are formed by adding an affix to the beginning or end of a Latin or Greek root or root word. When affixes are added to the beginning of roots or root words, they are called prefixes For example, the most common prefix is un-, which meant not oropposite of.
Michael Quinion, Ologies and Isms: Word Beginnings and Endings (Oxford, 2002) has this to say about the prefix semi-:
semi- Half, a part. {Latin semi-, half.}
Th strict sense of a half occurs only in a minority of words, of which examples are semicircle; semidiameter; semilunar; shaped like a half-moon or crescent; and semiquaver, in British musical terminology a note having the time value of half a quaver, a sixteenth note. A few terms extend the idea to that of occurring twice in some time period, as in semi-annual, occurring twice a year (nominally every half year), and the North American semi-monthly, occurring or publishing twice a month (or every half month). A related idea occurs in semi-final, a match or round immediately preceding the final, the ‘half-final’.
Most terms in the prefix, however, signal that something is partially or incompletely so: semi-professional, semi-conscious, semi-retired, semi-literate, semi-skilled, semi-derelict, semiprecious, semiconducting (of a substance that has a conductivity between that of an insulator and that of most metals), and semipermeable (of a material or membrane that allows certain substances to pass through it but not others).
A similar analysis could be applied to English words that begin with half-: there are the exact one-half words (half-crown, half-dollar, halfmoon, half-hour), the approximately one-half words (half-cell, half-life, half-mast, halftone), and the the words where half- really just means partial (half-baked, half-cocked, halfhearted, half-light, half-truth).
Under the circumstances, I have trouble drawing a bright line between semi-skilled in «a semi-skilled position» and semi-sales in «a semi-sales position» and saying that the former constitutes a legitimate use of semi- but the latter does not.