difficulty in a job or undertaking that is stimulating to one engaged in it.
Military . the demand of a sentry for identification or a countersign.
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 .
the assertion that a vote is invalid or that a voter is not legally qualified.
Biology . the process of inducing or assessing physiological or immunological activity by exposing an organism to a specific substance.
Hunting . the crying of a hound on finding a scent.
to assert that (a voter) is not qualified to vote.
to expose an organism to a specific substance in order to assess its physiological or immunological activity.
Archaic . to lay claim to.
Verb (used without object)
to make or issue a challenge.
Hunting . (of hounds) to cry or give tongue on picking up the scent.
Adjective
donated or given by a private, corporate, or government benefactor on condition that the recipient raise an additional specified amount from the public
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