1. (noun) challenge
a demanding or stimulating situation
2. (noun) challenge
a call to engage in a contest or fight
3. (noun) challenge
questioning a statement and demanding an explanation
4. (noun) challenge
a formal objection to the selection of a particular person as a juror
5. (verb) challenge
a demand by a sentry for a password or identification
6. (verb) challenge, dispute, gainsay
take exception to
Synonyms: altercate, take exception, gainsay, challenge, quarrel, dispute, scrap, argufy
7. (verb) challenge
issue a challenge to
Synonyms: gainsay, take exception, dispute
8. (verb) challenge
ask for identification
Synonyms: gainsay, take exception, dispute
9. (verb) challenge, take exception
raise a formal objection in a court of law
Synonyms: challenge, gainsay, take exception, dispute
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Synonyms for challenge 
