Definition of modulate
modulated;
modulating
transitive verb
1
:to tune to a key or pitch
2
:to adjust to or keep in proper measure or proportion :temper
3
:to vary the amplitude, frequency, or phase of (a carrier wave or a light wave) for the transmission of information (as by radio);
also
:to vary the velocity of electrons in an electron beam
intransitive verb
1
:to play or sing with modulation
2
:to pass from one musical key into another by means of intermediary chords or notes that have some relation to both keys
3
:to pass gradually from one state to another
Writing? Check your grammar now!