Synonyms of key in English:

key

noun

  • 1 the key to the mystery lay elsewhere customer satisfaction is the key to success
    answer, clue, solution, explanation, pointer, cue, lead; basis of, foundation for, requisite for; condition, precondition, essential, means, way, route, path, passport, secret, formula; guide, gloss, glossary, interpretation, explication, translation, clarification, exposition, annotation, index, legend, code
  • 3 it was like the sixties all over again, in a more austerely intellectual key
    style, character, mood, vein, spirit, feel, feeling, flavour, quality, humour, atmosphere

adjective

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody