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• n  a demanding or stimulating situation
  they reacted irrationally to the challenge of Russian power
• n  a call to engage in a contest or fight
• n  questioning a statement and demanding an explanation
  his challenge of the assumption that Japan is still our enemy
• n  a formal objection to the selection of a particular person as a juror
• n  a demand by a sentry for a password or identification
• v  take exception to
  She challenged his claims
• v  issue a challenge to
  Fischer challenged Spassky to a match
• v  ask for identification
  The illegal immigrant was challenged by the border guard
• v  raise a formal objection in a court of law

• The challenge facing Holbrooke is underscored by two Predator drone attacks on villages in North and South Waziristan on Friday that killed some 15 people, dashing Pakistani hopes .
• The success of Wikipedia should give us pause before dismissing latest challenge to seemingly unbeatable Google.

• dispute
• gainsay
• take exception

News & Articles

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• Food Challenge seeks to recycle unused food, not waste it
  RENO -- A national Food Challenge to change the way people think about managing food and food waste is underway, but one local bakery is already implementing a food recycling program throughout our community.
  June 11, 2013 - FOX 11 Reno
• Athletics-World Challenge Meeting Moscow men/women results
  June 11 (Infostrada Sports) - Results from the World Challenge Meeting Moscow Men/Women on Tuesday Men's 100m1. Dwain Chambers (Britain) 10.32 2. Aleksandr Brednev (Russia) 10.33 3. Peter Emelieze (Nigeria) 10.41 Men's 400m1. Vladimir Krasnov (Russia) 46.08 2. Omar Cisneros (Cuba) 46.23 3. Radel Kashefrazov (Russia) 46.44 Men's 800m1. Andre Olivier (South Africa) 1:44.93 2. Yuriy Borzakovskiy ...
  June 11, 2013 - Reuters via Yahoo! News
• Humana Challenge markets discounts for Hope's birthday
  In honor of Bob Hope's 110th birthday today, the Humana Challenge in partnership with the Clinton Foundation will be offering a discounted deal for week-long grounds badges for next January's 55th annual PGA Tour event.
  June 11, 2013 - The Desert Sun

Quotes

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• Elizabeth II in Island Crisis (blog)
  The challenge now is to continue to show this clear and convening leadership while not losing sight of your ongoing work to secure the security, prosperity and dignity of our fellow human beings,she added.
• Bertrand Piccard in TopNews New Zealand
  Talking about the duration of the flight, the project's co-founder Bertrand Piccard said pilot Andre Borschberg "will stay up there as long as possible. Hopefully he will still be in the air at sunrise tomorrow. That is the challenge."
• Barack Obama in New York Times
  This kind of comprehensive agreement would be an important step forward in the effort to rally the world around a solution to our climate challenge,Obama said. "And we agreed that each of us would take significant mitigation actions and...