Modulation (Noun) — A musical passage moving from one key to another.
Modulation (Noun) — (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude, frequency or phase.
Modulation (Noun) — Rise and fall of the voice pitch.
Modulation (Noun) — A manner of speaking in which the loudness, pitch or tone of the voice is modified.
Modulation (Noun) — The act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect).