The Collaborative International Dictionary of English v.0.48:

Habituate \Ha*bit"u*ate\ (h[.a]*b[i^]t"[-u]*[asl]t), a.
   Firmly established by custom; formed by habit; habitual. [R.]
   --Hammond.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Habituate \Ha*bit"u*ate\ (h[.a]*b[i^]t"[-u]*[=a]t), v. t. [imp.
   & p. p. Habituated (h[.a]*b[i^]t"[-u]*[=a]`t[e^]d); p. pr.
   & vb. n. Habituating (h[.a]*b[i^]t"[-u]*[=a]`t[i^]ng).] [L.
   habituatus, p. p. of habituare to bring into a condition or
   habit of body: cf. F. habituer. See Habit.]
   1. To make accustomed; to accustom; to familiarize.
      [1913 Webster]

            Our English dogs, who were habituated to a colder
            clime.                                --Sir K.
                                                  Digby.
      [1913 Webster]

            Men are first corrupted . . . and next they
            habituate themselves to their vicious practices.
                                                  --Tillotson.
      [1913 Webster]

   2. To settle as an inhabitant. [Obs.] --Sir W. Temple.
      [1913 Webster]

WordNet (r) 3.0 (2006):

habituate
    v 1: take or consume (regularly or habitually); "She uses drugs
         rarely" [syn: use, habituate]
    2: make psychologically or physically used (to something); "She
       became habituated to the background music" [syn: habituate,
       accustom]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "habituate":
   acclimate, acclimatize, accommodate, accustom, adapt, addict,
   adjust, bear, break, break in, case harden, condition, confirm,
   domesticate, domesticize, endure, establish, familiarize, fix,
   gentle, harden, housebreak, inure, naturalize, orient, orientate,
   season, support, take to, tame, tolerate, train, use, wont