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modulation

mod·u·la·tion

modulation

 
pronunciation:
ma j leI shn [or] mad y leI shn
part of speech: noun
definition 1: the act or process of modulating, or the condition of being modulated.
definition 2: a change in the volume or tone of voice to reflect a particular emotion or context.
similar words:
tone
definition 3: variation of the frequency, amplitude, phase, or the like of an electromagnetic wave.