[ 'mɒdjʊleɪt ]
■ verb
1》 exert a modifying influence on; regulate.
2》 vary the strength, tone, or pitch of (one's voice).
↘alter the amplitude or frequency of (an oscillation or signal) in accordance with the variations of a second signal.
3》 Music change from one key to another.
Derivatives
modulation noun
modulator noun
Origin
C16 (earlier (ME) as modulation ): from L. modulat- , modulari 'measure, make melody', from modulus (see modulus ).