a call or summons to engage in any contest, as of skill, strength, etc.
2.
something that by its nature or character serves as a call to battle, contest, special effort, etc.: Space exploration offers a challenge to humankind.
3.
a call to fight, as a battle, a duel, etc.
4.
a demand to explain, justify, etc.: a challenge to the treasurer to itemize expenditures.
5.
difficulty in a job or undertaking that is stimulating to one engaged in it.
6.
Military. the demand of a sentry for identification or a countersign.
7.
Law.a formal objection to the qualifications of a particular juror, to his or her serving, or to the legality of an entire jury. Compare peremptory challenge.
8.
the assertion that a vote is invalid or that a voter is not legally qualified.
9.
Biology. the process of inducing or assessing physiological or immunological activity by exposing an organism to a specific substance.
10.
Hunting.the crying of a hound on finding a scent.
verb (used with object)
11.
to summon to a contest of skill, strength, etc.
12.
to take exception to; call in question: to challenge the wisdom of a procedure.
13.
to demand as something due or rightful.
14.
Military. to halt and demand identification or countersign from.
15.
Law.to take formal exception to (a juror or jury).
16.
to have a claim to; invite; arouse; stimulate: a matter which challenges attention.
17.
to assert that (a vote) is invalid.
18.
to assert that (a voter) is not qualified to vote.
19.
to expose an organism to a specific substance in order to assess its physiological or immunological activity.
20.
Archaic.to lay claim to.
verb (used without object)
21.
to make or issue a challenge.
22.
Hunting.(of hounds) to cry or give tongue on picking up the scent.
adjective
23.
donated or given by a private, corporate, or government benefactor on condition that the recipient raise an additional specified amount from the public: a challenge grant.
Origin: 1175–1225;Middle Englishchalenge < Old French, variant of chalonge < Latincalumniacalumny
Related forms
chal·lenge·a·ble, adjective
pre·chal·lenge, verb (used with object), pre·chal·lenged, pre·chal·leng·ing.
re·chal·lenge, verb (used with object), re·chal·lenged, re·chal·leng·ing.
1292, from O.Fr. chalenge "accusation, claim, dispute," from L. calumnia "trickery" (see calumny). Accusatory connotations died out 17c. Meaning "a calling to fight" is from 1530. Challenged as a euphemism for "disabled" dates from 1985.