American Heritage Dictionary
(19)
Century Dictionary
(18)
GNU Webster's 1913
(3)
WordNet
(9)
Elsewhere on the web
So, certainly the challenge was there.— A.J. Jacobs' year of living biblically
A challenge is a challenge even iff'n the challenge is a verbal one.
Another challenge is the cost for condominium complexes to add space for recycling bins.— Island Packet: Home
Complicating the challenge is the cost of bringing on stream previously planned new infrastructure and caring for an aging population, said Hughes.— Top Stories - Google News
Still another challenge is the inherent conflict between fighting a deadly enemy and winning the hearts of the local villagers with whom the enemy lives.— PrairiePundit

American Heritage Dictionary (1)
Century Dictionary (2)
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Bubble height: used more or less than expected, vs. all uses evenly distributed
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