Definition of clef noun from the Oxford Advanced Learner's Dictionary

 

clef

 noun
noun
BrE BrE//klef//
 
; NAmE NAmE//klef//
 
(music) Reading music
 
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a symbol at the beginning of a line of printed music (called a stave or staff ) that shows the pitch of the notes on it the treble/bass clef See related entries: Reading music Word Origin late 16th cent.: from French, from Latin clavis ‘key’.
See the Oxford Advanced American Dictionary entry: clef