Webster's English Dictionary

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modulation

mod.u.la.tion \.ma:j-*-'la--sh*n\ n 1: a regulating according to measure or 
   proportion : TEMPERING  2: an inflection of the tone or pitch of the voice 
   specif : the use  of stress or pitch to convey meaning 3: a changing from 
   one tonality to another by regular melodic or chord succ ession 4: the 
   variation of the amplitude, frequency, or phase of a carrier or sign al in 
   telegraphy, telephony, radio, or television