key

key · noun/adjective/verb

imported

Definitions

noun/adjective/verb

  1. 1.

    A small piece of shaped metal used to open or close a lock.

  2. 2.

    A button on a computer keyboard, typewriter, or musical instrument.

  3. 3.

    Something that provides access, understanding, or a solution.

  4. 4.

    (Music) A scale of notes defining the tonal center of a piece.

  5. 5.

    Of crucial importance; essential.

  6. 6.

    To enter data using a keyboard.

  7. 7.

    To scratch or vandalize (a car) with a key.

Forms

plural: keys

Phrases & expressions

  • •
    key to success — the essential element for achieving goals
  • •
    key player — an important participant
  • •
    key in — to enter data using a keyboard
  • •
    under lock and key — securely locked away
  • •
    low-key — understated or modest
  • •
    off-key — out of tune

Related words

Antonyms: minor, trivial, unimportant
See also: crucial, essential, keyboard, lock
Synonyms: crucial, essential, fundamental, vital

Etymology

From Old English cǣg ("key"), of unknown ultimate origin. The word has been used in English since at least the 7th century.