Source : Webster's Revised Unabridged Dictionary (1913)

Librarian \Li*bra"ri*an\ (l[-i]*br[=a]"r[i^]*an), n. [See
   {Library}.]
   1. One who has the care or charge of a library.

   2. One who copies manuscript books. [Obs.] --Broome.

Source : WordNet®

librarian
     n : a professional person trained in library science and engaged
         in library services [syn: {bibliothec}]