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 ?
Who can challenge? The PSPs who wish to challenge must be legally, technically and financially capacitated.
If the Inca Challenge sounds rather strenuous then why not try the Viking Challenge? This offers the chance to ride an Icelandic horse across the amazing and varied landscapes of Iceland.
Why did the FBI go to Oz to find a name for part of its Fitness Challenge? Several years before the FBI became involved, the U.S.