challenge

challenge
chal·lenge 'chal-ənj vt, chal·lenged; chal·leng·ing to administer a physiological and esp. an immunologic challenge to (an organism or cell)
challenge n the process of provoking or testing physiological activity by exposure to a specific substance esp a test of immunity by exposure to an antigen after immunization against it

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chal·lenge (chalґənj) 1. to administer a chemical substance to a patient for observation of whether the normal physiological response occurs. 2. in immunology, to administer antigen to evoke an immune response in a previously sensitized individual. Called also antigenic c. 3. the administration of such a chemical or antigen in order to assess for a response. Called also challenge test, provocative test, and provocation.

Medical dictionary. 2011.

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  • challenge — chal·lenge 1 vt chal·lenged, chal·leng·ing 1: to dispute esp. as being invalid or unjust counsel challenged this interpretation 2: to question formally (as by a suit or motion) the legality or legal qualifications of challenge the regulations;… …   Law dictionary

  • challenge — [ ʃalɑ̃ʒ; tʃalɛndʒ ] n. m. • 1884; mot angl. « défi »; a. fr. « débat, chicane », forme pop. du lat. calumnia → calomnie ♦ Anglic. 1 ♦ Épreuve sportive dans laquelle le vainqueur détient un prix, un titre jusqu à ce qu un vainqueur nouveau l en… …   Encyclopédie Universelle

  • challenge — chal‧lenge [ˈtʆælndʒ] noun [countable] 1. ACCOUNTING a careful check of the cash and shares etc held by the employees of a company, as part of an official check to discover if there has been any dishonesty 2. something difficult that you feel… …   Financial and business terms

  • Challenge — Chal lenge, n. [OE. chalenge claim, accusation, challenge, OF. chalenge, chalonge, claim, accusation, contest, fr. L. calumnia false accusation, chicanery. See {Calumny}.] 1. An invitation to engage in a contest or controversy of any kind; a… …   The Collaborative International Dictionary of English

  • Challenge — Chal lenge, v. t. [imp. & p. p. {Challenged}; p. pr. & vb. n. {Challenging}.] [OE. chalengen to accuse, claim, OF. chalengier, chalongier, to claim, accuse, dispute, fr. L. calumniar to attack with false accusations. See {Challenge}, n., and cf.… …   The Collaborative International Dictionary of English

  • Challenge 21 — is a scheme in the United Kingdom introduced by the British Beer and Pub Association (BBPA) aimed at preventing young people gaining access to age restricted products including cigarettes and alcohol.[1] Under the scheme, customers attempting to… …   Wikipedia

  • Challenge — Hebdo  Pour l’article homonyme, voir Challenges.   Challenge Hebdo {{{nomorigine}}} …   Wikipédia en Français

  • Challenge — Brownsville, CA U.S. Census Designated Place in California Population (2000): 1069 Housing Units (2000): 580 Land area (2000): 9.664709 sq. miles (25.031480 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000):… …   StarDict's U.S. Gazetteer Places

  • Challenge, CA — Challenge Brownsville, CA U.S. Census Designated Place in California Population (2000): 1069 Housing Units (2000): 580 Land area (2000): 9.664709 sq. miles (25.031480 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area… …   StarDict's U.S. Gazetteer Places

  • challenge — [chal′ənj] n. [ME & OFr chalenge, accusation, claim, dispute < L calumnia, CALUMNY] 1. a demand for identification [a sentry gave the challenge] 2. a calling into question; a demanding of proof, explanation, etc. [a challenge of the premises… …   English World dictionary

  • Challenge — (engl. für „Herausforderung“) bezeichnet: das Sicherheitsprotokoll Challenge Handshake Authentication Protocol das Plattenlabel Challenge Records einen Begriff aus dem American Football die internationale Serie von Triathlon Wettkämpfen Challenge …   Deutsch Wikipedia

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