The Collaborative International Dictionary of English v.0.48:

Library \Li"bra*ry\ (l[imac]"br[asl]*r[y^]), n.; pl. Libraries
   (-r[i^]z). [OE. librairie, F. librairie bookseller's shop,
   book trade, formerly, a library, fr. libraire bookseller, L.
   librarius, from liber book; cf. libraria bookseller's shop,
   librarium bookcase, It. libreria. See Libel.]
   1. A considerable collection of books kept for use, and not
      as merchandise; as, a private library; a public library.
      [1913 Webster]

   2. A building or apartment appropriated for holding such a
      collection of books. --Holland.
      [1913 Webster]