noun
plural keys
[count] a device that is used to open a lock or start an automobile
The usual type of key is a small metal object that you insert into a narrow opening and turn.
a device that looks like a key and that is used to turn something
something that is necessary in order to do or achieve something - usually singular
usually + to
something that provides an explanation or solution - usually + to
a list of words or phrases that explain the meaning of symbols or abbreviations
any one of the buttons of a computer or typewriter that you push with your fingers
any one of the parts that you push with your fingers to play a piano or similar musical instrument
music :a system of musical tones based on a scale beginning on the note for which the system is named
under lock and key
adjective
extremely important
verb
keys; keyed; keying
[+ obj] to enter (information) by using the keys of a computer, typewriter, etc.
US informal :to have the most important part in (something)
key to
[phrasal verb] chiefly US
key (something) to (something or someone) :to make (something) suitable for (a particular use or type of person)
key (something) to (something) :to change (something) in a way that is closely related to (something else) - usually used as (be) keyed to
noun
plural keys
[count] :a low island or reef
the Keys :a group of small islands off the southern coast of Florida - compare 1key