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challenger

[chal-in-jer]
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noun
  1. a person or thing that challenges.
  2. Boxing. a boxer who fights a champion for his championship title.
  3. Radio. interrogator(def 2).
  4. (initial capital letter, italics) U.S. Aerospace. the second space shuttle to orbit and return to earth: exploded 1½ min. after launch on Jan. 28, 1986, causing the death of all seven on board.
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Origin of challenger

Middle English word dating back to 1250–1300; see origin at challenge, -er1
Related formsnon·chal·leng·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for challenger

n.

late 13c., "a claimant;" mid-14c., "one who makes false charges;" mid-15c., "one who disputes something, objector," from Anglo-French chalengeour (Old French chalongeor "slanderer, petitioner, plaintiff"), agent noun from challenge (v.). Specific sense of "one who calls out another in a contest" is from 1510s.

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Online Etymology Dictionary, © 2010 Douglas Harper