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  1.                 From WordNet dictionary, version 3.0:
                

    
                
                  
    modulate
v. 1. change the key of, in music; "modulate the melody"
2. vary the pitch of one's speech
Synonyms: tone, inflect
3. fix or adjust the time, amount, degree, or rate of; "regulate the temperature"; "modulate the pitch"
Synonyms: regulate
4. adjust the pitch, tone, or volume of
5. vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)

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