The Collaborative International Dictionary of English v.0.48:

Inflect \In*flect"\, v. t. [imp. & p. p. Inflected; p. pr. &
   vb. n. Inflecting.] [L. inflectere, inflexum; pref. in- in
   + flectere to bend. See Flexible, and cf. Inflex.]
   1. To turn from a direct line or course; to bend; to incline,
      to deflect; to curve; to bow.
      [1913 Webster]

            Are they [the rays of the sun] not reflected,
            refracted, and inflected by one and the same
            principle ?                           --Sir I.
                                                  Newton.
      [1913 Webster]

   2. (Gram.) To vary, as a noun or a verb in its terminations;
      to decline, as a noun or adjective, or to conjugate, as a
      verb.
      [1913 Webster]

   3. To modulate, as the voice.
      [1913 Webster]

WordNet (r) 3.0 (2006):

inflect
    v 1: change the form of a word in accordance as required by the
         grammatical rules of the language
    2: vary the pitch of one's speech [syn: tone, inflect,
       modulate]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "inflect":
   analyze, arch, bend, bend back, bow, bracket, conjugate, crook,
   curl, curve, decline, decurve, deflect, dome, embow, flex, hook,
   hump, hunch, hyphenate, incurvate, incurve, intonate, loop, mark,
   modulate, parenthesize, parse, point, punctuate, recurve, reflect,
   reflex, retroflex, round, sag, swag, sweep, turn, vault, wind