Meaning of MODULATION in English

MODULATION

( n. )

A change of key, whether transient, or until the music becomes established in the new key; a shifting of the tonality of a piece, so that the harmonies all center upon a new keynote or tonic; the art of transition out of the original key into one nearly related, and so on, it may be, by successive changes, into a key quite remote. There are also sudden and unprepared modulations.

Webster's Revised Unabridged English Dictionary.      Пересмотренный полный словарь английского языка Webster.