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key [ˈkiː]

1 key noun
  • a device that is used to open a lock or start an automobile —often used figuratively
  • 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

2 key adjective
  • extremely important

3 key verb
  • to enter (information) by using the keys of a computer, typewriter, etc. —often + in —often + into
  • to have the most important part in (something)

4 key noun
  • a low island or reef
  • a group of small islands off the southern coast of Florida