noun

 

for locks 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.

 

method a way of explaining or achieving something

Hard work is the key to success.

 

keyboard one of the parts you press with your fingers on a keyboard or musical instrument to produce letters, numbers, or to make a sound

 

music a set of musical notes based on one particular note

the key of D major

 

symbols a list which explains the symbols on a map or picture

 

answers a list of answers to an exercise or game

 

adjective

 

very important in influencing or achieving something

a key factor/player