The Collaborative International Dictionary of English v.0.48:

Familiarize \Fa*mil"iar*ize\, v. t. [imp. & p. p.
   Familiarized; p. pr. & vb. n. Familiarizing.] [Cf. F.
   familiariser.]
   1. To make familiar or intimate; to habituate; to accustom;
      to make well known by practice or converse; as, to
      familiarize one's self with scenes of distress; we
      familiarized ourselves with the new surroundings.
      [1913 Webster]

   2. To make acquainted, or skilled, by practice or study; as,
      to familiarize one's self with a business, a book, or a
      science.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

familiarized \familiarized\ adj.
   having become familiar.

   Syn: adjusted, acquainted.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

familiarized
    adj 1: having achieved a comfortable relation with your
           environment [syn: adjusted, familiarized,
           familiarised]