Definition of "enharmonic" [en•har•mon•ic]

• Music 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. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "There are three classes of modes: first, that which the Greeks term the enharmonic; second, the chromatic; third, the diatonic."
• "F# and Gb are enharmonic, that is, they are the same note but spelled differently."
• "Since the second waltz is in the key of C-sharp minor, the "Minute" waltz contrasts by being in the enharmonic parallel major key D-flat major."