1. A book in which things to be remembered are recorded.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• xommonplace book,
• vommonplace book,
• fommonplace book,
• dommonplace book,
• cimmonplace book,
• ckmmonplace book,
• clmmonplace book,
• cpmmonplace book,
• c0mmonplace book,
• c9mmonplace book,
• conmonplace book,
• cokmonplace book,
• cojmonplace book,
• comnonplace book,
• comkonplace book,
• comjonplace book,
• comminplace book,
• commknplace book,
• commlnplace book,
• commpnplace book

The adjective form of the word "commonplace book" is "commonplace".

The plural of the "commonplace book" can be the "commonplace books".

The singular of the "commonplace book" can be the "commonplace book".