criterial

criterion

[krahy-teer-ee-uhn]
noun, plural criteria [krahy-teer-ee-uh] , criterions.
a standard of judgment or criticism; a rule or principle for evaluating or testing something.

Origin:
1605–15; < Greek kritḗrion a standard, equivalent to kri- variant stem of krī́nein to separate, decide + -tērion neuter suffix of means (akin to Latin -tōrium -tory2)

criterial, adjective

criteria, criterion (see usage note at the current entry).


measure, touchstone, yardstick. See standard.


Like some other nouns borrowed from the Greek, criterion has both a Greek plural, criteria, and a plural formed on the English pattern, criterions. The plural in -a occurs with far greater frequency than does the -s plural: These are the criteria for the selection of candidates. Although criteria is sometimes used as a singular, most often in speech and only infrequently in edited prose, in standard English, it is more clearly used as a plural with criterion as the singular.
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World English Dictionary
criterion (kraɪˈtɪərɪən)
 
n , pl -ria, -rions
1.  a standard by which something can be judged or decided
2.  philosophy a defining characteristic of something
 
usage  Criteria, the plural of criterion, is not acceptable as a singular noun: this criterion is not valid; these criteria are not valid

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

criterion
1660s, from Gk. kriterion "means for judging, standard," from krites "judge."
Online Etymology Dictionary, © 2010 Douglas Harper
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