altered chord

noun Music.

a chord in which at least one tone has been changed from its normal pitch in the key.

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British Dictionary definitions for altered chord

altered chord

noun

music a chord in which one or more notes are chromatically changed by the introduction of accidentals

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012