criterion

noun

1. a basis for comparison; a reference point against which other things can be evaluated

   noun.communication

   Synonyms measure standard touchstone

   Source: WordNet 3.0

2. the ideal in terms of which something can be judged

   noun.cognition

   Synonyms standard

   Source: WordNet 3.0

3. 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.

   noun

   Source: webster1913