key (object that opens and closes a lock)
key (object that is inserted into a device and rotated to activate it)
any of several tools designed to turn screws, bolts, nuts, etc., especially a spanner
curly bracket (name of the characters { and })
key (crucial step, element or requirement)
keys (free access to something)
key; password
key (a string used to encode or decode text)
key (value that identifies a row in a table)
a key of a wind instrument
tuning lever; tuning wrench; hammer (tool used to tune certain stringed instruments)
winder (key or knob used to wind a clockwork mechanism)
the switch of a circuit breaker
the clue to an answer
group; pool (in a tournament, a set of players or team who play against one another)
joint lock
the mechanism that activates a switch
the keystone of a vault
(obsolete) Synonym of clave
clavis; key (groups of information used for identifying a taxon)

key; crucial; indispensable