WordReference Random House Unabridged Dictionary of American English © 2026
key′ sig′nature, [Music.]
  1. Music and Dance(in notation) the group of sharps or flats placed after the clef to indicate the tonality of the music following.
  • 1870–75

Collins Concise English Dictionary © HarperCollins Publishers::
key signature n
  1. 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
'key signature' also found in these entries (note: many are not synonyms or translations):
accidental - relative - signature - time signature - transposing instrument

Forum discussions with the word(s) "key signature" in the title:


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