noun

• An institution which holds books and/or other forms of media for use by the public or qualified people often lending them out, as well as providing various other services for its users.
• (by extension) Any institution that lends out its goods for use by the public or a community.
• A collection of books or other forms of stored information.
• An equivalent collection of analogous information in a non-printed form, e.g. record library.
• A room dedicated to storing books.
• (programming) A collection of software routines that provide functionality to be incorporated into or used by a computer program.
• (genetics) A collection of DNA material from a single organism or relative to a single disease.
• (card games) The deck or draw pile.