challenge(redirected from nasal challenge)
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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)
To cause an interrogator to transmit a signal which puts a transponder into operation.
Administration of an antigen to ascertain state of immunity.