Criterion

Cri*te"ri*on (kr?-t?"r?-?n), n.; pl. Criteria (-?), sometimes Criterions (-?nz). [Gr. ????? a means for judging, fr. ???? decider, judge, fr. ????? to separate. See Certain.] A standard of judging; any approved or established rule or test, by which facts, principles opinions, and conduct are tried in forming a correct judgment respecting them.

Of the diseases of the mind there is no criterion.
Donne.

Inferences founded on such enduring criteria.
Sir G. C. Lewis.

Syn. -- Standard; measure; rule.