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challenge
'challenge' - used as a noun
1. a demanding or stimulating situation
they reacted irrationally to the challenge of Russian power
2. a call to engage in a contest or fight
3. questioning a statement and demanding an explanation
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
5. a demand by a sentry for a password or identification

'challenge' - used as a verb
6. take exception to
She challenged his claims
7. issue a challenge to
Fischer challenged Spassky to a match
8. ask for identification
The illegal immigrant was challenged by the border guard
9. raise a formal objection in a court of law

derived forms
1. Challenge / Plural
challenges
2. Challenge / Past
challenged
3. Challenge / Third Person
challenges
4. Challenge / Present Participle
challenging
Variations of 'challenge'
 
Past Words of the day
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Who Said that ?
I saw Chungking for the first time more than 40 years ago - a city of hills and mists, of grays and lavenders, two rivers shaping it to a point and the cliff rising above me like a challenge. - Click here to find out.
Fact of the day
Seven asteroids were especially named for the Challenger astronauts who were killed in the 1986 failed launch of the space shuttle.