The Collaborative International Dictionary of English v.0.48:

Chant \Chant\, v. i.
   1. To make melody with the voice; to sing. "Chant to the
      sound of the viol." --Amos vi. 5.
      [1913 Webster]

   2. (Mus.) To sing, as in reciting a chant.
      [1913 Webster]

   To chant horses or To chaunt horses, to sing their
      praise; to overpraise; to cheat in selling. See
      Chaunter. --Thackeray.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chant \Chant\, n. [F. chant, fr. L. cantus singing, song, fr.
   canere to sing. See Chant, v. t.]
   1. Song; melody.
      [1913 Webster]

   2. (Mus.) A short and simple melody, divided into two parts
      by double bars, to which unmetrical psalms, etc., are sung
      or recited. It is the most ancient form of choral music.
      [1913 Webster]

   3. A psalm, etc., arranged for chanting.
      [1913 Webster]

   4. Twang; manner of speaking; a canting tone. [R.]
      [1913 Webster]

            His strange face, his strange chant.  --Macaulay.
      [1913 Webster]

   Ambrosian chant, See under Ambrosian.

   Chant royal [F.], in old French poetry, a poem containing
      five strophes of eleven lines each, and a concluding
      stanza. -- each of these six parts ending with a common
      refrain.

   Gregorian chant. See under Gregorian.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chant \Chant\, v. t. [imp. & p. p. Chanted; p. pr. & vb. n.
   Chanting.] [F. chanter, fr. L. cantare, intens. of canere
   to sing. Cf. Cant affected speaking, and see Hen.]
   1. To utter with a melodious voice; to sing.
      [1913 Webster]

            The cheerful birds . . . do chant sweet music.
                                                  --Spenser.
      [1913 Webster]

   2. To celebrate in song.
      [1913 Webster]

            The poets chant in the theaters.      --Bramhall.
      [1913 Webster]

   3. (Mus.) To sing or recite after the manner of a chant, or
      to a tune called a chant.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chant
    n 1: a repetitive song in which as many syllables as necessary
         are assigned to a single tone
    v 1: recite with musical intonation; recite as a chant or a
         psalm; "The rabbi chanted a prayer" [syn: chant,
         intone, intonate, cantillate]
    2: utter monotonously and repetitively and rhythmically; "The
       students chanted the same slogan over and over again" [syn:
       tone, chant, intone]