Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. One that challenges: a challenger of established authority.
- n. Sports One who competes against the holder of a title or championship, as in boxing.
Century Dictionary and Cyclopedia
- n. One who challenges or defies another to a duel or contest of any kind.
- n. An objector; one who calls in question.
- n. A claimant; one who demands something as of right.
Wiktionary
- n. One who challenges.
GNU Webster's 1913
- n. One who challenges.
WordNet 3.0
- n. the contestant you hope to defeat
Examples
“� Her main challenger is Jose Serra, a former governor who was trailing at 33 percent.”
“The French ace beat his title challenger Mikko Hirvonen by over two minutes with the Finn's compatriot and Ford Fiesta teammate Jari-Matti Latvala in third, 2:32.sec adrift.”
“Oliver Shoffren�s side came up against another title challenger last week and although it only saw them take one point from a possible six against Norstar B, Shoffren was satisfied that his side gave as much as they could.”
“The winner of the heavyweight main event will determine the title challenger next in line once Brock Lesnar recovers from his sickness and puts his belt up against Shane Carwin.”
“Again, when you are the incumbent, and your challenger is a virtual unknown, this is not a good result.”
Discourse.net: Outpouring of Support for Candidate Running Against Obama's Heckler
“Benfica is always considered a title challenger, and nothing is decided yet, but I think we have taken an important step toward" the title, Luisão told reporters after the win over Braga.”
“The latter form of politics is grounded in being what I call a challenger -- i.e., someone who presumes that whites are racist until they prove otherwise by granting preferences of some kind to minorities.”
“Or, if the challenger is a conservative, then the Democrat wins as the Republican and the challenger split the vote.”
covering baseball for USATODAY.com.Fregosi getting it from all sides
“MONTREAL -- It's rare that a title challenger gets an immediate rematch in mixed martial arts.”
Lists
These user-created lists contain the word ‘challenger’.
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POL - presidential debates
Some of the catchwords of several presidential debates (Obama-Romney 2012 Denver debate's transcript fully included)
autistic, skyrocket, enroll, taxing, decamp, Depression, niceness, cutback, revenue, fend for, empathy, uninsured and 150 more...
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EN - academic vocabulary
Use these and get promoted
abandon, abandonment, abnormally, abstract, abstraction, abstractly, abstracts, academia, academic, academically, academics, academies and 3119 more...
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Brand Theft Auto
A marque list for cars--models or companies who've used common words as their name.
explorer, navigator, frontier, mustang, quest, cougar, sidekick, legend, legacy, ranger, voyager, civic and 266 more...
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NASA
A place for NASA-related stuff, from Mercury, Gemini, Apollo, Skylab, etc.
faithful shepard, lunar module, command service m..., trajectory, moon shot, apollo, mercury, gemini, skylab, viking, velcro, tang and 103 more...
Tweets
Looking for tweets for challenger.

oroboros Alas, the ill-fated Space Shuttle. :( Aug 21, 2007