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Dictionary definition for: Modulate

1. (v) change the key of, in music; "modulate the melody"

2. (v) of one''s speech, varying the pitch

3. (v) fix or adjust the time, amount, degree, or rate of; "regulate the temperature" "modulate the pitch"

4. (v) adjust the pitch, tone, or volume of

5. (v) vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)

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