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]

WordNet (r) 3.0 (2006):

familiarize
    v 1: make familiar or conversant with; "you should acquaint
         yourself with your new computer"; "We familiarized
         ourselves with the new surroundings" [syn: familiarize,
         familiarise, acquaint]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "familiarize":
   acclimate, acclimatize, accommodate, accustom, acquaint, adapt,
   adjust, advertise, advertise of, advise, apprise, break, break in,
   brief, bring word, case harden, communicate, condition, confirm,
   disclose, domesticate, domesticize, enlighten, establish, fix,
   gentle, give notice, give the facts, give word, habituate, harden,
   housebreak, inform, instruct, inure, leave word, let know,
   mention to, naturalize, notify, orient, orientate, report, season,
   send word, serve notice, speak, tame, tell, train, use, verse,
   wont