What does book mean?
A book is a set of written, printed, or blank pages fastened together along one edge and enclosed within covers, serving as one of humanity's most enduring vehicles for recording knowledge and telling stories. Beyond its physical sense, 'book' extends to the works themselves — a novel, biography, or textbook may all be called books regardless of format, including digital editions. The word also functions as a verb meaning to reserve a seat, room, ticket, or service ahead of time, as in booking a flight. Figurative uses are plentiful: someone described as 'an open book' is easy to read emotionally, while acting 'by the book' means following rules strictly. Financial 'books' refer to ledgers of account. Rooted in Old English and shared across Germanic languages, 'book' is among the most familiar words in English, carrying connotations of learning, leisure, permanence, and trustworthiness.
A bound set of printed or written pages, or the complete written work it contains.
"Her first book was published when she was only twenty-three."
In publishing contexts, 'book' refers both to the physical object and to the intellectual work itself, including electronic editions.
To reserve accommodation, tickets, or a service in advance; also, informally, to charge someone with an offense (chiefly British).
"They booked a cabin in the mountains for the long weekend."
British English commonly uses 'booked' for being officially charged by police; this sense is rare in American English.
'Book' is a regular countable noun; the plural 'books' follows standard formation and is used identically in British and American English.
"The library added two thousand new books to its shelves this year."
The word 'book' may share an ancient root with 'beech' — early Germanic peoples carved their runic inscriptions into beechwood tablets before paper ever existed.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of book
'Book' descends from Old English 'bōc', which in turn comes from Proto-Germanic '*bōks'. Many scholars believe the term ultimately relates to the beech tree, since Germanic peoples carved runes on beechwood tablets or staves, making 'beech' and 'book' possible siblings from a common root. Close cognates appear throughout the Germanic family, including German 'Buch', Dutch 'boek', and Swedish 'bok', reflecting the word's ancient and widespread heritage.
Related word forms
How book is actually used
As a noun, 'book' is neutral in register and used across formal and informal contexts. The verb 'to book' is standard in British English for reservations; American English equally uses it, though 'make a reservation' can sound slightly more formal. In informal speech, 'booked' can also mean extremely full or committed ('I'm booked solid all week').