Criterion is a noun. This word traces its origin in Greek and is taken from the word Kriterion. It is the singular form of criteria. However many people use the word criteria when they are speaking about a single reason for something. For example: further criteria needs to be considered. But instead of criteria, one should make use of criterion in the given sentence. Thus the sentence should be: further criterion needs to be considered.
Criterion is a standard which is established so that a judgment or decision, especially a scientific one, can be made. For example: what is the main criterion for awarding the prize? Criterion could be synonymous to measure, standard, principle. Touchstone, yardstick, hallmark benchmark, archetype, guideline, guide, gauge, measurement, level of achievement, paradigm, specification, requirement, rule and sample.
Criterion is a standard which is established so that a judgment or decision, especially a scientific one, can be made. For example: what is the main criterion for awarding the prize? Criterion could be synonymous to measure, standard, principle. Touchstone, yardstick, hallmark benchmark, archetype, guideline, guide, gauge, measurement, level of achievement, paradigm, specification, requirement, rule and sample.