Definitions

1. noun

A book or sheet of paper that is 2 inches (about 5 cm) square, especially one that is published in a series.

“The bookstore had an impressive collection of duodecimos featuring the works of famous authors.”

2. noun

A term used in bookbinding to describe a book with 12 leaves or sheets of paper, regardless of the paper size.

“The book conservator carefully examined the duodecimo’s binding to determine its age and origin.”