The Collaborative International Dictionary of English v.0.48:

Integrate \In"te*grate\, v. t. [imp. & p. p. Integrated; p.
   pr. & vb. n. Integrating.] [L. integratus, p. p. of
   integrare to make whole, renew: cf. F. int['e]grer. See
   Integer, Entire.]
   [1913 Webster]
   1. To form into one whole; to make entire; to complete; to
      renew; to restore; to perfect. "That conquest rounded and
      integrated the glorious empire." --De Quincey.
      [1913 Webster]

            Two distinct substances, the soul and body, go to
            compound and integrate the man.       --South.
      [1913 Webster]

   2. To indicate the whole of; to give the sum or total of; as,
      an integrating anemometer, one that indicates or registers
      the entire action of the wind in a given time.
      [1913 Webster]

   3. (Math.) To subject to the operation of integration; to
      find the integral of.
      [1913 Webster]

WordNet (r) 3.0 (2006):

integrate
    v 1: make into a whole or make part of a whole; "She
         incorporated his suggestions into her proposal" [syn:
         integrate, incorporate] [ant: disintegrate]
    2: open (a place) to members of all races and ethnic groups;
       "This school is completely desegregated" [syn: desegregate,
       integrate, mix] [ant: segregate]
    3: become one; become integrated; "The students at this school
       integrate immediately, despite their different backgrounds"
    4: calculate the integral of; calculate by integration [ant:
       differentiate]

Moby Thesaurus II by Grady Ward, 1.0:

117 Moby Thesaurus words for "integrate":
   accommodate, add, adjust, admix, alloy, amalgamate, arrange,
   articulate, assemble, assimilate, attune, balance, bemingle, blend,
   bring together, coalesce, combine, come together, commingle,
   commix, compact, compensate, compose, compound, comprise,
   concatenate, concentrate, concoct, conform, conglomerate, conjoin,
   connect, consolidate, constitute a whole, coordinate,
   counterbalance, counterpoise, countervail, desegregate, embody,
   emulsify, encompass, entity, equalize, equate, even, even up, fit,
   flux, form a unity, fuse, harmonize, hash, homogenize, immingle,
   immix, include, incorporate, integral, interblend, interfuse,
   interlace, interlard, intermingle, intermix, intertwine,
   interweave, join, jumble, knead, knit, level, link, lump together,
   make a whole, make one, meld, melt into one, merge, mesh, mingle,
   mingle-mangle, mix, mix up, orchestrate, organize, poise,
   proportion, proportionate, put together, reconcile,
   reduce to unity, reembody, regularize, roll into one, scramble,
   shade into, shuffle, solidify, square, stir up, strike a balance,
   sum, symmetrize, symphonize, syncretize, syndicate, synthesize,
   system, systematize, throw together, toss together, totality, tune,
   unify, unite, work