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key signature

noun, Music.
1.
(in notation) the group of sharps or flats placed after the clef to indicate the tonality of the music following.
Origin
1870-1875
1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for key-signature

key signature

noun
1.
(music) a group of sharps or flats appearing at the beginning of each stave line to indicate the key in which a piece, section, etc, is to be performed
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
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