开本

Traditional form:

開本

Pinyin (reading):

kāiběn

Definitions:

• book format, similar to in-4°, in-8° etc (a 16-kai format 16開／16开 (shiliu-kái) is roughly A4) (abbr. to 開／开 (kāi))

Characters:

• 开 - to open; to start, to initiate, to begin
• 本 - root, origin, source; basis

Traditional characters:

• 開 - to open; to start, to initiate, to begin
• 本 - root, origin, source; basis