The Collaborative International Dictionary of English v.0.48:

Memorize \Mem"o*rize\, v. t. [imp. & p. p. Memorized; p. pr. &
   vb. n. Memorizing.] [See Memory.]
   [1913 Webster]
   1. To cause to be remembered; hence, to record. [Obs.]
      [1913 Webster]

            They neglect to memorize their conquest. --Spenser.
      [1913 Webster]

            They meant to . . . memorize another Golgotha.
                                                  --Shak.
      [1913 Webster]

   2. To commit to memory; to learn by heart.
      [1913 Webster]

WordNet (r) 3.0 (2006):

memorize
    v 1: commit to memory; learn by heart; "Have you memorized your
         lines for the play yet?" [syn: memorize, memorise,
         con, learn]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "memorize":
   commit to memory, con, get, get by heart, get letter-perfect,
   have by heart, know by heart, learn, learn by heart,
   learn verbatim, parrot, recite, remember, repeat, repeat by heart,
   retain, study, swot up