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Meaning of “key” - Learner’s Dictionary

key

noun [C]     /kiː/
FOR LOCKS
A1 a piece of metal cut into a particular shape and used for locking things such as doors, or for starting an engine: I've lost my car keys.Locking and bolting
METHOD
B1 a way of explaining or achieving something: Hard work is the key to success.Ways of achieving things
KEYBOARD
B2 one of the parts you press with your fingers on a keyboard or musical instrument to produce letters, numbers, or to make a soundComputer hardwareKeyboard instruments
MUSIC
a set of musical notes based on one particular note: the key of D majorTechnical music terms
SYMBOLS
a list that explains the symbols on a map or pictureMaps and map-makingSigns, signals and symbolsSpecific signs and symbols
ANSWERS
A2 a list of answers to an exercise or game →  See also under lock and key Solving and solutions
(Definition of key noun from the Cambridge Learner’s Dictionary © Cambridge University Press)
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