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Of, relating to, or involving tones that are identical in pitch but are written differently according to the key in which they occur, as C sharp and D flat, for example.
[Late Latin enharmonicus, from Greek enarmonios : en-, in; see en-2 + harmoniā, harmony; see harmony.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Music, other) denoting or relating to a small difference in pitch between two notes such as A flat and G sharp: not present in instruments of equal temperament such as the piano, but significant in the intonation of stringed and wind instruments
2. (Music, other) denoting or relating to enharmonic modulation
[C17: from Latin enharmonicus, from Greek enarmonios, from en-2 + harmonia; see harmony]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
en•har•mon•ic(ˌɛn hɑrˈmɒn ɪk)
having the same pitch in the tempered scale but written in different notation, as G sharp and A flat.
[1590–1600; < Late Latin enharmonicus < Greek enarmónios (-icus replacing -ios) =en- en-1 + harmónios harmonious]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.