key signature definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Music one or more sharps or flats placed after the clef on the staff to indicate the key
key signature definition by American Heritage Dictionary
The group of sharps or flats placed to the right of the clef on a staff to identify the key.
key signature for A major