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 …

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

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

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 …

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.

It met all our criteria; a stable employment, reasonably priced homes, a state college and a regional hospital. Few cases met fell within our criteria. So also he has drawn a close parallel between the …

Criterion is defined as “a standard on which a judgment or decision may be based” or “a characterizing mark or trait.” The former of these is the meaning in question when one says, “An important criterion …

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 …

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