(plural criteria) a standard for judging something

test, gauge for judgment

(an instrument used for measuring) the thickness of wire, sheets of metal, rubber on a tyre etc; the distance between rails for a train (or between opposite wheels of a train)

measure, standard

a standard of behaviour, appearance, speech etc expected or asked for; an average standard of achievement (e.g. in an exam)

average, standard

a standard used for comparison

gauge