Definition of modulation
1
: an inflection of the tone or pitch of the voice
specifically
: the use of stress or pitch to convey meaning
2
: a regulating according to measure or proportion : tempering
3
: a change from one musical key to another by modulating
4
: the process of modulating a carrier or signal (as in radio)
also
: the result of this process
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Merriam-Webster unabridged
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Time Traveler for modulation
The first known use of modulation was in 1501
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