Noun

• S: (n) challenge (a demanding or stimulating situation) "they reacted irrationally to the challenge of Russian power"
• direct hypernym / inherited hypernym / sister term
• S: (n) situation, state of affairs (the general state of things; the combination of circumstances at a given time) "the present international situation is dangerous"; "wondered how such a state of affairs had come about"; "eternal truths will be neither true nor eternal unless they have fresh meaning for every new social situation"- Franklin D.Roosevelt
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• S: (n) challenge (a call to engage in a contest or fight)
• S: (n) challenge (questioning a statement and demanding an explanation) "his challenge of the assumption that Japan is still our enemy"
• S: (n) challenge (a formal objection to the selection of a particular person as a juror)
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• S: (n) challenge (a demand by a sentry for a password or identification)
• direct hypernym / inherited hypernym / sister term
• derivationally related form

Verb

• S: (v) challenge, dispute, gainsay (take exception to) "She challenged his claims"
• S: (v) challenge (issue a challenge to) "Fischer challenged Spassky to a match"
• S: (v) challenge (ask for identification) "The illegal immigrant was challenged by the border guard"
• S: (v) challenge, take exception (raise a formal objection in a court of law)