Definition of "librarian"

librarian

/laɪˈbɹɛɹ.i.ən/

noun
plural librarians
1. The keeper, manager of a library.
  Quotations
  The amenities of the institute include a well-arranged open-access library of 18,000 volumes, and a small but valuable reference library of railway literature; the present writer is Librarian.
  1944 May and June, Arthur B. Longbottom, “The Derby Railway Institute”, in Railway Magazine, page 149
2. One who cares for the publications, files etc. in a library, whether staff or volunteer.
3. A person who processes and organizes information.