Criteria is typically a plural noun referring to standards on which a judgement can be made. Its singular form is criterion, but evidence shows that criteria is frequently used as a singular as well as a plural.

Criteria are often the particular requirements that someone or something must meet in order to be considered or qualify for something. An applicant for a job may be evaluated based on several …

plural of criterion (Definition of criteria from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Just 16 percent said having knowledge and skills that apply to a specific field is the most important criteria they seek. An "ethnic" membership criterion that one would be embarrassed to invoke for any …

We're looking for a very specific sort of person and this woman seems to fulfill all of our criteria. More specific and less subjective criteria should be used in selecting people for promotion within the …

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Information about all of the scholarships and eligibility criteria can be found here.

In standard usage, the plural is generally criteria, although criterions is sometimes used as well. Properly speaking, the form criteria should never be a singular noun, and phrases like this criteria and single …

Definition of criterion noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Although criteria is sometimes used as a singular, most often in speech and rather infrequently in edited prose, it continues strongly in use as a plural in standard English, with criterion as the singular.