1. Adjust the pitch, tone, or volume of
   "The singer modulated her voice to suit the emotional content of the song"
    
2. Vary the pitch of one's speech
   "The speaker modulated his voice for emphasis";
   - tone, inflect
    
3. (music) change from one key to another
   "modulate the melody"
    
4. Fix or adjust the time, amount, degree, or rate of
   "modulate the pitch";
   - regulate
    
5. Vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)
   "The radio station modulated the signal to improve reception"

Derived forms: modulates, modulated, modulating

Type of: adjust, alter, change, correct, mouth, play, set, speak, spiel, talk, utter, vary, verbalise [Brit], verbalize

Encyclopedia: Modulate