Entry 5 senses · 4 variants Webster, 1913 Commonplace /käm'-ən-plāsˌ/ · Com·mon·place · IPA /ˈkɑmənˌpleɪs/ a. n. v. t. v. i. 01 a. Common; ordinary; trite; as, a commonplace person, or observation. 1. Common; ordinary; trite; as, a commonplace person, or observation. 02 n. An idea or expression wanting originality or interest; a trite or customary remark; a platitude. 1. An idea or expression wanting originality or interest; a trite or customary remark; a platitude. 2. A memorandum; something to be frequently consulted or referred to. “Whatever, in my reading, occurs concerning this our fellow creature, I do never fail to set it down by way of commonplace.” — Swift. Phrases & compounds Commonplace book — a book in which records are made of things to be remembered. 03 v. t. To enter in a commonplace book, or to reduce to general heads. 1. To enter in a commonplace book, or to reduce to general heads. 04 v. i. To utter commonplaces; to indulge in platitudes. 1. To utter commonplaces; to indulge in platitudes.[Obs.]