1. A demanding or stimulating situation (synset 113955981)
    "they reacted irrationally to the challenge of Russian power"
  2. A call to engage in a contest or fight (synset 107245954)
  3. Questioning a statement and demanding an explanation (synset 107208065)
    "his challenge of the assumption that Japan is still our enemy"
  4. A formal objection to the selection of a particular person as a juror (synset 107223225)
  5. A demand by a sentry for a password or identification (synset 107206229)
  1. Take exception to (synset 200870790)
    "She challenged his claims"
  2. Issue a challenge to (synset 200870255)
    "Fischer challenged Spassky to a match"
  3. Ask for identification (synset 200810005)
    "The illegal immigrant was challenged by the border guard"
  4. Raise a formal objection in a court of law (synset 200809824)

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