A prefix is an affix which is placed before the stem of a word

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Why does “quadratic” describe second power while “quad” usually describes “four”?

In mathematics, quadratic means "involving the second and no higher power of an unknown quantity or variable". But the prefix quad- usually describes something that has to do with four, such as ...
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“Unregister” vs “Deregister”

The concept of "undoing a registration" is widely used in my line of work. While most dictionaries define unregister as the proper verb for it, several widely used and highly considered sources also ...
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What we've gelost — why doesn't English use the prefix “ge-”?

The Germanic languages that I'm familiar with all use a prefix similar to ge- on past participles: German: Ich habe mir den Fuß gebrochen. Dutch: Ik heb mijn voet gebroken. But English ...
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“Unselect” or “Deselect”?

If I want the user to revert their operation of selecting an item, should I say: "Unselect the option" or "Deselect the option"?
31
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Why are not “infamous” and “inflammable” the opposite of “famous” and “flammable”?

Why are not infamous and inflammable the opposite of famous and flammable, like incomplete, inactivity, inappropriate and so on?
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Is there a reason to use “mono” over “uni”?

I'm just interested in knowing if there is any non-arbitrary basis for using prefixes "mono" or "uni" when words are initially being coined. As far as I can tell, they mean the same thing as a prefix. ...
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Is there a general rule for the prefixation of “un-” and “de-” to words?

Given the different questions we have seen about the prefixes "de-" and "un-", I have grown curious if there is a overarching rule for terms that need undoing. “Unselect” or “Deselect”? “Unregister” ...
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How does the “be-” prefix change the words to which it is applied? How did it come about?

What does the be- prefix change when applied to adjectives and verbs? There are many such words that seemed to be coined of this process, for example: behold, beget, befallen, beridden, ...
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What is the opposite of “meta”?

A while back I was talking about it with friends. Another question indicates a few meanings of the "meta-" prefix. Considering that "meta" means, in simple words, "about itself" (like how metadata is ...
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Isn't the word “uninstall” wrong?

I've never understood this. Why is the proper usage "uninstall"? You can't actually "unin" something at all and this isn't that case with most (all?) other use cases. Examples: You make someone ...
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What is the antonym of the prefix retro-?

A coworker and I are discussing the word "retromingent", which means urinating backwards. We are wondering what the opposite would be: the word that means urinating forwards. What is the opposite of ...
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A word that means 'most important'?

I tried to find a single word that means "most important", but I couldn't. I want it to be able to express what's missing below: If you get hurt, the _ thing to do is to stay calm. It would ...
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What is the opposite of the “sub” prefix?

The term subcategories refers to lower level categories. Which term should I use to refer to higher level categories? Does supercategories sound right?
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Why “unequal” but “inequality”?

The opposite of "equal" is "unequal", yet there is no word "unequality". Why do we use "inequality" instead?
16
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“Biweekly”, “bimonthly”, “biannual”, and “bicentennial”

What do lengths of time with the "bi" prefix mean"? I have understood bicentennial as once every two hundred years, but biannual as meaning twice a year. Do biweekly and bimonthly mean twice a week or ...
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“Instable” or “unstable”?

From my experience, it seems that although unstable is more commonly used, instable is often preferred in engineering and scientific contexts, e.g. "aircraft instability", "instable algorithm". Are ...
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What is a good replacement for “ununderstandable”?

I want to tell a colleague of mine I'm doing something that will prevent her from getting "ununderstandable" errors. I have: ...so that you will not get unnecessary, [ununderstandable] errors. ...
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How productive is the prefix “un-”?

Is it possible to use un- with new words such as sit, sleep, sad? I'm currently seeing many words (in programming) which use "un-" in the meaning of undoing something. For example, is it possible to ...
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4answers
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Proper term for knowing four or more languages?

If bilingual means you know two languages, and trilingual means you know three, what would be the proper term for knowing four, five or even six languages?
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“pseudo-”, “quasi-” “semi-” and

I was wondering about the meaning of "pseudo-", "quasi-" "semi-" and possibly other related prefixes, in general cases. Particularly, in engineering and science, there are quite a few terms named ...
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Logical meaning of the word “understand”

To understand something means to be aquainted with it, to know it very well, know how it "ticks". This is one of the basic words that has a direct "meaning" in mind. However, if we "dissect" it, is ...
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2answers
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Why does “unisex” mean both sexes?

There are some places where men and women are segregated — for example public toilets and public swimming pool changing areas. By this I mean, for example, that there are "Men's toilets" and "Ladies' ...
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What is the history of adding the a- prefix to form words?

I have always found the a- prefix to words (as in anew, ajar, aside, awake, afoot, a-hunting, etc.) fascinating. The NOAD says on this topic: a- 2. prefix •to; toward : aside | ashore. ...
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Using “non-” to prefix a two-word phrase

Does "non-" prefixed to a two word phrase permit another hyphen before the second word? If I want to refer to an entity which is defined as the negation of another entity by attaching "non-" it seems ...
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What is the story behind “a-” prefix / suffix?

For example, If this van's a-rockin', don't come a-knockin' Here We Come A-caroling (song title) Come on-a My House (song title) I have a few related questions: What is the "a-" or "-a" called? ...
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Prefix or adjective meaning “one and a half”

Is there a prefix or adjective that means "one and a half", as "tri-" or "triple" is for "three"? The exact usage I have is to describe "18" in terms of a dozen. Where I live they've started making ...
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What is it called when you add 'im' to 'possible'?

I took the ESL certification test and I was wondering: what is it called when you add 'im' to 'possible'?
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Is there a prefix that indicates that an event recurs four times a year?

"Semi-annually" describes an event that recurs every 6 months. Is there a similar term for an event that recurs every 3 months? (I'm guessing that "semi-semi-annually" isn't the correct answer.) More ...
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What is the opposite of “enroll”?

Deenroll? Unenroll? I understand words like cancel and resign would work, but is there an appropriate antonym with "enroll" in it?
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Pronunciation of en- prefix as ahn-

Recently, I pronounced the word enqueue as ahn-queue. The person I was talking to said he would have pronounced it with a more normal en sound (like in Ben or den). I'm not sure why I thought that ...
8
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1answer
492 views

Un-(adjective) but In-(noun) — does it ever go the other way?

Many pairs of words use un- as a prefix for the preferred adjective but in- as a prefix for the preferred noun (e.g. unstable/instability, unequal/inequality, unable/inability, unjust/injustice, ...
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“Irregardless” vs. “irrespective”

Why is irrespective considered a proper word but irregardless is not?
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Origins of negative prefixes like in-, un-, il-, ir-, dis-, a-

I've read here about origins of in- and un- negative prefixes. Are there any known origins of other negative prefixes such as il-, ir-, dis-, a-?
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If the prefix anglo- means “of the English”, what prefix means “of the Welsh”?

The title says it all! Even if Anglo doesn't quite mean "of the English" you get what I mean.
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If “hexa-” is a prefix representing six

Why does the word "hexadecimal" have the prefix "hexa-" if it has a base of 16, not 6?
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“Undertake” and “overtake”

Under- and over- seem to be prefixes with contrary meanings. But with the example of undertake and overtake, I don't see contrary meanings between them. Am I missing something?
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“Undistinguishable” vs. “indistinguishable”

Is there a difference between these two words? To me, it seems that undistinguishable is more where you can't tell what it is, and indistinguishable seems to be where they're the same. It seems a lot ...
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What is a prefix that means near?

For instance, if I were to describe someone as being *near-*carnivorous, I'm have the goal of depicting them as being a heavy meat eater that includes very few forms of non-meat based food in their ...
7
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1answer
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What are the correct spelling and regional distribution of “X, schmX” to indicate dismissiveness (e.g., “evidence, schmevidence”)?

There is a curious construct in American English in which a word is stated and then repeated with the prefix "schm-" or "shm-" in order to indicate the speaker's dismissive attitude toward a concern ...
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1answer
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How does one capitalize words like “un-American”?

Google's dictionary lists it as "un-American" or "unAmerican" (which looks clumsy to me). Since American is a "demonym," I would usually capitalize it, so I feel compelled to capitalize "un-American" ...
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Are there any patterns to observe in choosing the correct negation prefix to use?

Are there any patterns to observe in choosing the correct prefix to use? There are other prefixes as well, but these are usually the ones I mix up. As in unbelievable, disproportionate, asymmetric, ...
7
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1answer
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The significance of “y”

Regarding the pronoun "your", ignoring the singular possessive form. Is there some significance to the "prefix" y or is this a coincidence? Our: Collective possession, including me. Y our: ...
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Using the “ex” prefix on a multiple word subject

What is the proper way to use the "ex" prefix to more than one word? Examples: He is an ex-school bus driver. My ex baseball coach taught me. I am an ex-Fish and Game Warden. ...
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Any other words that use “dis-” as an amplifying prefix?

I remember hearing once about the etymology of disgruntled, probably based around a joke about how people can not be gruntled. The explanation given was that there was never a word gruntled, rather ...
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intro- vs. intra-

I recently found out that “extrovert” is a misspelling and that it’s actually written extravert. That makes sense, because other words use the same prefix, e.g. extraordinary, extradite, etc., but ...
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Is “dispreferred” a mainstream word in English?

I just recently came across the word dispreferred in a linguistic document. I have never heard the word used before, rather I generally hear something like "preferred something else" in everyday ...
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Why isn't the word “undiscovered” a double negative?

Why do we use the word undiscovered? As far as I know, un– and dis– have the same negative meaning; why don't we just say "covered"?
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adding a prefix “re” to a word, with or without a hyphen?

In science we often invent words, but that doesn't mean we know how to spell them. Most of the time words are invented by adding prefixes. In that case should there be a hyphen or not? Specifically, I ...
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What comes in between predecessor and successor?

I'd like a good word for "current item in a succession of items". Let's say I am looking ahead, towards my successor. Back behind me, I can also see my predecessor. What am I? I'd hate to use the ...
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'Irrealistic' or 'unrealistic'?

I basically learnt that words that start with a 'm' or 'p' get 'im' as a negative prefix, whilst words starting with 'r' get 'ir' in such a case (irreverent, irrelevant). However, I stumbled upon ...