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The Collaborative International Dictionary of English v.0.48 (gcide)

Modulate \Mod"u*late\, v. i. (Mus.)
To pass from one key into another.
[1913 Webster]


Modulate \Mod"u*late\, v. t. [imp. & p. p. {Modulated}; p. pr. &
vb. n. {Modulating}.] [L. modulatus, p. p. of modulari to
measure, to modulate, fr. modulus a small measure, meter,
melody, dim. of modus. See {Mode}.]
1. To form, as sound, to a certain key, or to a certain
portion.
[1913 Webster]

2. To vary or inflect in a natural, customary, or musical
manner; as, the organs of speech modulate the voice in
reading or speaking.
[1913 Webster]

Could any person so modulate her voice as to deceive
so many? --Broome.
[1913 Webster]

3. (Electronics) To alter the amplitude, frequency, phase, or
intensity of (the carrier wave of a radio signal) at
intervals, so as to represent information to be conveyed
by the signal; -- a technique used to convey information
by means of radio waves transmitted by one electronic
device and received by another.
[WordNet 1.5]