CHALLENGES
- CHALLENGE, to summon (someone) to settle a matter by fighting or by any kind of contest [v]
- CHALLENGE [v]
- An attempt to win a contest or championship in a sport
- An objection or query as to the truth of something, often with an implicit demand for proof
- A sentry's call for a password or other proof of identity
- An objection regarding the eligibility or suitability of a jury member
- Exposure of the immune system to pathogenic organisms or antigens
- A call to take part in a contest or competition, esp. a duel
- A task or situation that tests someone's abilities
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