key‧board [countable]
1 a board with buttons marked with letters or numbers that are pressed
to put information into a computer or other machine:
 a computer keyboard
a computer keyboard
2 the row of keys on some musical instruments that you press in
order to play them
3 also keyboards [plural] an electronic musical instrument similar
to a piano that can make sounds like many different instruments [↪ synthesizer]:
 Chris Kelly (guitar) and Benny Hayes
(keyboards and vocals)
Chris Kelly (guitar) and Benny Hayes
(keyboards and vocals)
Definition from the Longman
Dictionary of Contemporary English 
Advanced Learner's Dictionary
Advanced Learner's Dictionary
 
 
 
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