Definitions for key signature
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Random House Webster's College Dictionary
key′ sig`nature(n.)
(in musical notation) the group of sharps or flats placed after the clef to indicate the tonality of the music following.
Category: Music and Dance
Princeton's WordNet
key signature, signature(noun)
the sharps or flats that follow the clef and indicate the key
Wiktionary
key signature(Noun)
An indication of the key of a composition, giving the number of sharps or flats in the corresponding scale.
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