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Definition of key signature noun from the Oxford Advanced Learner's Dictionary

key signature

noun
 
/ˈkiː sɪɡnətʃə(r)/
 
/ˈkiː sɪɡnətʃər/
(music)
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  1. the set of marks at the beginning of a printed piece of music to show what key the piece is inTopics Musicc2
See key signature in the Oxford Advanced American Dictionary
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