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Challenge Definition

(noun)
definitions

a call to someone to participate in a competitive situation or fight to decide who is superior in terms of ability or strength


examples

he accepted the challenge

(noun)
definitions

a call to prove or justify something


examples

a challenge to the legality of the banning order

(noun)
definitions

the administration of an immunogenic or infectious agent to an animal or person, in order to study the resulting immune response or measure the efficacy of a vaccine


examples

challenge trials have yielded positive results when carefully and ethically conducted

human challenge studies occur in tightly controlled settings

recently vaccinated calves should be protected from challenge

(verb)
definitions

invite (someone) to engage in a contest


examples

he challenged one of my men to a duel

organizations challenged the government in by-elections

(verb)
definitions

dispute the truth or validity of


examples

it is possible to challenge the report's assumptions

(verb)
definitions

administer an immunogenic or infectious agent to an animal or person, in order to study the resulting immune response or measure the efficacy of a vaccine


examples

the mice were challenged with the influenza virus

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