a melodic ornamental tone following a principal tone by a step above or below and returning to the principal tone; embellishment.
Words nearby auxiliary tone
Also called auxiliary note.
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British Dictionary definitions for auxiliary note
music a nonharmonic note occurring between two harmonic notes
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