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    Online English Dictionary

    Wordnet English Dictionary

    noun
    a demanding or stimulating situation; "they reacted irrationally to the challenge of Russian power"
    a call to engage in a contest or fight
    questioning a statement and demanding an explanation; "his challenge of the assumption that Japan is still our enemy"
    a formal objection to the selection of a particular person as a juror
    a demand by a sentry for a password or identification
    verb
    take exception to; "She challenged his claims"
    issue a challenge to; "Fischer challenged Spassky to a match"
    ask for identification; "The illegal immigrant was challenged by the border guard"
    raise a formal objection in a court of law

    Wordnet English Thesaurus

    noun
    dare, defiance, confrontation, provocation, test, trial, hurdle, obstacle, question, ultimatum
    verb
    dare, defy, confront, brave, accost, provoke, test, tax, try, provocation, summons, dispute, question, query, protest, stimulate

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