part of speech: noun

definition 1: a metal object cut in a special way to open or close locks.

definition 2: something that leads to or helps someone get something.

  • Hard work is the key to success.

definition 3: a list that gives an explanation of codes or symbols.

  • We read a key to understand a map.

synonyms: legend

definition 4: a button or part of a machine or musical instrument that makes it work when pressed.

  • This computer has twelve function keys.
  • The piano has eighty-eight keys.

definition 5: the main tone of the scale in a musical work.

  • This song is written in the key of C.


part of speech: adjective

definition: main; central.

  • He made the key point in the discussion.

synonyms: cardinal, central, chief, essential, fundamental, main, primary

phrase: key up