Source : Webster's Revised Unabridged Dictionary (1913)

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.