Real Dictionary

library
countable noun: A public library is a building where things such as books, newspapers, videos, and music are kept for people to read, use, or borrow.

library in American English
a collection of books, periodicals, musical scores, films, phonograph records, etc., esp. a large, systematically arranged collection for reading or reference
noun: a place set apart to contain books, periodicals, and other material for reading, viewing, listening, study, or reference, as a room, set of rooms, or building where books may be read or borrowed

library in British English
noun: a room or set of rooms where books and other literary materials are kept