Synonyms of key in English:

key

noun

  • 2 the key to the mystery the key to success
    answer, clue, solution, explanation; basis, foundation, requisite, precondition, means, way, route, path, passport, secret, formula

adjective

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space