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challenge:
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Concise Oxford English Dictionary © 2008 Oxford University Press:
challenge/ˈtʃalənʤ/
▶noun
  • 1 a call to someone to participate in a contest or fight to decide who is superior.

    ■ a demanding task or situation.

    ■ an attempt to win a sporting contest.

  • 2 a call to prove or justify something.
  • 3 Medicine exposure of the immune system to pathogenic organisms or antigens.
▶verb
  • 1 dispute the truth or validity of.

    ■ Law object to (a jury member).

    ■ (of a guard) order (someone) to prove their identity.

  • 2 invite (someone) to engage in a contest or fight.

    ■ make a rival claim to (a position).

    ■ (usu. as adj. challenging) test the abilities of.

  • 3 Medicine expose (the immune system) to pathogenic organisms or antigens.
– derivatives
challengeable adjective,
challenger noun,
challengingly adverb.
– origin ME: from OFr. chalenge (n.), chalenger (v.), from L. calumnia ‘calumny’, calumniari ‘calumniate’.



'challenge' also found in these Oxford entries:
Forum discussions with the word(s) "challenge" in the title:
" no difficulty only challenge " is correct ?
"Ella Minnow Pea" - A challenge
"It is a bit of a challenge, ..."
"live up to" the challenge.
0-60 challenge
a distant challenge looming over the horizon
a great challenge:
be much of a challenge
big deal= big/hard challenge ?
Cabral's authoritarian style led to a challenge...
Challenge
challenge
Challenge cup
challenge for / to
challenge was designing/ was to design
challenge/s
collocations with challenge
constructive challenge
credible challenge/force
Dare and Challenge
Defining Challenge
face a new challenge
failing to question and challenge
First is the challenge of...
Fluid challenge based on cardiovascular mechanism... ?
Foul vs Unfair challenge
Horn's biggest challenge came/arose
I ____ every assignment a challenge.
I 'challenge' my uncle to deny .... [invite to compete?]
I am not clear on using "challenge"
more...

Look up "challenge" at Merriam-Webster
Look up "challenge" at dictionary.com

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