/ Dictionary / Index C commonplace book: Meaning and Definition of Find definitions for: com'monplace book" Pronunciation: [key] a book in which noteworthy quotations, comments, etc., are written. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. commonplace common pleas Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language