challenge

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challenge

1. US an assertion that a person is not entitled to vote or that a vote is invalid
2. Law a formal objection to a person selected to serve on a jury (challenge to the polls) or to the whole body of jurors (challenge to the array)

challenge

[′chal·ənj]
(communications)
To cause an interrogator to transmit a signal which puts a transponder into operation.
(immunology)
Administration of an antigen to ascertain state of immunity.
References in periodicals archive ?
The researchers, led by Dr Swetlana Schwetz from the Federal Scientific Research Centre in Moscow, said: 'The blocker was significantly more effective than placebo and reduced the typical symptoms of allergic rhinitis in response to nasal challenge with allergen by nearly 60 per cent.
Correlation between symptoms and the threshold for release of mediators in nasal secretions during nasal challenge with grass pollen grains.
Allergy Testing and Desensitization: Allergy referral, Allergy testing and desensitization therapy; Serial Endpoint Allergy Testing; Immunotherapy for malignant disease; Leukocyte Histamine Release Test (LHRT); Screening for Hypersensitivity Reactions to Foods and Chemicals, In Vitro Particle Size Measurement; Nasal Challenge Test; Rhinitis, allergic - referral criteria; Transfer factor; Allergy notes.