What is Challengeable?

Challengeable definition and meaning on Dictionary terms:
a call or summons to engage in any contest, as of skill, strength, etc.
something that by its nature or character serves as a call to battle, contest, special effort, etc.: Space exploration offers a challenge to humankind.

a call to fight, as a battle, a duel, etc.
a demand to explain, justify, etc.: a challenge to the treasurer to itemize expenditures.
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.

verb (used with object), chal