(1):

(v. i.) To utter commonplaces; to indulge in platitudes.

(2):

(n.) A memorandum; something to be frequently consulted or referred to.

(3):

(v. t.) To enter in a commonplace book, or to reduce to general heads.

(4):

(n.) An idea or expression wanting originality or interest; a trite or customary remark; a platitude.

(5):

(a.) Common; ordinary; trite; as, a commonplace person, or observation.