Source : Webster's Revised Unabridged Dictionary (1913)

Inflection \In*flec"tion\, n. [L. inflexio : cf. F. inflexion.
   See {Inflect}.] [Written also {inflecxion}.]
   1. The act of inflecting, or the state of being inflected.

   2. A bend; a fold; a curve; a turn; a twist.

   3. A slide, modulation, or accent of the voice; as, the
      rising and the falling inflection.

   4. (Gram.) The variation or change which words undergo to
      mark case, gender, number, comparison, tense, person,
      mood, voice, etc.

   5. (Mus.)
      (a) Any change or modification in the pitch or tone of the
          voice.
      (b) A departure from the monotone, or reciting note, in
          chanting.

   6. (Opt.) Same as {Diffraction}.

   {Point of inflection} (Geom.), the point on opposite sides of
      which a curve bends in contrary ways.

Source : WordNet®

inflection
     n 1: a change in the form of a word (usually by adding a suffix)
          to indicate a change in its grammatical function [syn: {inflexion}]
     2: the patterns of stress and intonation in a language [syn: {prosody}]
     3: deviation from a straight or normal course [syn: {flection},
         {flexion}]
     4: a manner of speaking in which the loudness or pitch or tone
        of the voice is modified [syn: {modulation}]