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In many publications, especially IT related, I find lots of expressions with criteria e.g.

  • What is your criteria ...
  • What are your criteria ...
  • What are your criterias ...

English dictionary says that criteria (or criterions) is a plural form of criterion. However, I never found sentences like "What is your criterion ..." or "What are your criterions ..."

Can you explain what is the correct usage of criteria.

Are criterions and criterion still in use in modern English or they have become obsolete?

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Criteria is a bit of an unusual word—while it is formally considered plural, it is often used as if it were singular. Using it as singular, though, is considered nonstandard, so beware of that.

Criterion is uncommon and criterions is rare, but neither are so rarely used that I would consider them obsolete.

So

  • What are your criteria? - OK - are goes with plural words
  • What is your criteria? - maybe OK - if you're comfortable with criteria being singular
  • What is your criterion? - OK - criterion is always singular—but remember that someone might have multiple criteria
  • What are your criterias? - not OK - if/when criteria is treated as singular, is it used as a mass noun
  • What are your criterions? - OK - but rare
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    I think criteria is like data in this regard. – Kit Z. Fox Jan 24 '13 at 1:10
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    This reasoning may fit ELU -- but is not advisable on ELL at all. cf. ell.stackexchange.com/a/160/99 – Kris Jan 24 '13 at 5:55
  • @Kris What reasoning, and why on Earth not? – waiwai933 Jan 24 '13 at 5:58
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    @Kris Well, I don't think it's particularly complex—I talk about criteria, criterion and criterions for three sentences, and then address the OP's examples. I'll add Wiktionary links to the first two paragraphs, but not everything necessarily needs to be cited 100% of the time. – waiwai933 Jan 24 '13 at 6:55
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    Criterion is not unusual. See this Google Ngram. – Ben Kovitz May 23 '16 at 14:39
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Criteria is plural, criterion is singular. That's just the way it is, if you want to sound educated. Consider that it's an awfully erudite word to throw around in an illiterate manner.

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    +1 Many pedants such as myself care about using foreign plurals as in the source language where appropriate. Authenticity and consistency are basic principles of literary style and of style in general. In Greek, the singular is criterion, the plural criteria. In the large majority of cases, using the correct plural and singular forms as in Greek and Latin is preferred in educated style, as Rob says. – Cerberus Jan 24 '13 at 7:50
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    I'd like to add that I think part of the reason criterion is so rare is just this: how often do you actually have a single criterion? Most of the time when a situation necessitates the use of the word criteria, you have more than one. I'd be hard-pressed to think of a common, real-life sitation in which something has a single criterion. – WendiKidd Feb 5 '13 at 0:33
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    @WendiKidd: "Our sole criterion for buying that [something] was [some reason]." You hear constructions like that all the time. So the singular is not rare, nor even uncommon. – Robusto Mar 8 '14 at 18:30
  • To me (native AmE), criterion does not sound erudite. It's just an ordinary word. Criterias sounds ignorant and pretentious. Different people perceive these things differently, of course. – Ben Kovitz May 23 '16 at 14:37
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Since the word is of Greek origin and I am Greek I can definitely say that

  • criterion is singular, and

  • criteria is plural

exactly as in Greek, unlike other Greek words used in English which are completely embedded in the English grammar (like idea, problem, system, and photography).

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    English has a habit of changing the spelling and words it takes from other languages. Just because it is a certain way in Greek does not mean it is that way in English. I'm not saying you're wrong, just that your reasoning is flawed. – ColleenV May 23 '16 at 17:01
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Criteria is used in business/office communications, for instance in Tender and Quotation requests. The main place I see it used relates to employment offers which will often contain a document detailing the Selection Criteria, and one of the main parts of the application will be responding to these criteria.

Criterion, in my experience, is rarely used outside of discussion involving the criteria that the criterion is part of. For instance, the employment application might say: "As mentioned in the first criterion, I can ...", or "I have responded to the marketing criterion as well as the public relations criterion in this paragraph as they ...".

There is nothing erudite about the use of either the plural or singular in this context.

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