To book is defined as to make reservations for something in advance.(verb)
An example of book is when you buy airline ticket reservations.
The definition of book is a story or collection of stories that can be read.(noun)
An example of book is a novel by John Grisham.
See book in Webster's New World College Dictionary
Origin: ME bok < OE boc, pl. bec < PGmc *bokiz, beech, beechwood tablets carved with runes < IE *bhagos, beech > beech, Gr phagos, L fagus
See book in American Heritage Dictionary 4
Origin: Middle English bok
Origin: , from Old English bōc; see bhāgo- in Indo-European roots.
Learn more about book