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requisite vs. prerequisite

requisite
[rek-wuh-zit] / ˈrɛk wə zɪt /

adjective

  1. required or necessary for a particular purpose, position, etc.; indispensable.

    the requisite skills of an engineer.
    Synonyms:
    needful, needed
    Antonyms:
    dispensable

noun

  1. something requisite; a necessary quality, thing, etc.

    Synonyms:
    necessity
    Antonyms:
    luxury
prerequisite
[pri-rek-wuh-zit, pree-] / prɪˈrɛk wə zɪt, pri- /

adjective

  1. required beforehand.

    a prerequisite fund of knowledge.

noun

  1. something prerequisite.

    A visa is still a prerequisite for travel in many countries.
    Synonyms:
    precondition, essential, requisite, requirement