The Collaborative International Dictionary of English v.0.48:

memorabilia \mem`o*ra*bil"i*a\, n. pl. [L., fr. memorabilis
   memorable. See Memorable.]
   1. Things remarkable and worthy of remembrance or record;
      also, the record of them.
      [1913 Webster]

   2. Mementos of past events; souvenirs.
      [PJC]

WordNet (r) 3.0 (2006):

memorabilia
    n 1: a record of things worth remembering