1. Also called circulating library, rental library. a small library that is maintained by a commercial establishment, as a drugstore, and is composed largely of current books that are lent to customers for a fee.
2. Chiefly Brit.a public library that lends materials or the division or section of it that carries out this function.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.