(1):

(n.) One of the three liberal arts forming the trivium.

(2):

(a.) Of or pertaining to the trivium.

(3):

(a.) Found anywhere; common.

(4):

(a.) Of little worth or importance; inconsiderable; trifling; petty; paltry; as, a trivial subject or affair.

(5):

(a.) Ordinary; commonplace; trifling; vulgar.