Source : Webster's Revised Unabridged Dictionary (1913)

Intonate \In"to*nate\, v. i. [L. intonatus, p. p. of intonare to
   thunder, resound.]
   To thunder. [Obs.] --Bailey.

Intonate \In"to*nate\, v. i. [imp. & p. p. {Intonated}; p. pr. &
   vb. n. {Intonating}.] [See {Intone}.]
   1. (Mus.) To sound the tones of the musical scale; to
      practice the sol-fa.

   2. To modulate the voice in a musical, sonorous, and measured
      manner, as in reading the liturgy; to intone.

Intonate \In"to*nate\, v. t.
   To utter in a musical or sonorous manner; to chant; as, to
   intonate the liturgy.

Source : WordNet®

intonate
     v 1: speak carefully, as with rising and falling pitch or in a
          particular tone; "please intonate with sadness" [syn: {intone}]
     2: recite with musical intonation; recite as a chant or a
        psalm; "The rabbi chanted a prayer" [syn: {chant}, {intone},
         {cantillate}]