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 / Synonym of clave

key; crucial; indispensable

adjustable spanner (UK), adjustable wrench (US), adjustable wrench (US), crescent spanner (AU, NZ)

Allen key, Allen wrench

skeleton key (a key that opens a range of locks) / anything which creates opportunities

Alternative spelling of chave-mestra

keyword (word used as an identifier of a document to assist in searching)

Allen key (a hex head wrench)

(databases) foreign key (column referencing another table)

plumber wrench, Swedish wrench