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.

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

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 …

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 from the Oxford Advanced Learner's Dictionary. a standard or principle by which something is judged, or with the help of which a decision is made. The main criterion is value …

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

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.

• The company's criterion for success is high sales. • The criterion is the number of years before the pre-tax cash receipts from the project pay back the capital invested. • Other researchers use less strict …

What were the criteria used to choose the winner? Our main criterion for hiring new employees is that they have a lot of past work experience.

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