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English thesaurus
challenge ['ʧælɪnʤ] n
law	to make a formal objection to the qualifications of a potential jury or juror; Someone's right to object to or fight something in a legal case
mil., abbr.	chal
mil., logist.	Act of ascertaining the nature of a detected person, object or phenomenon and possibly even their nature or type. (FRA); Any process carried out by one unit or person with the object of ascertaining the friendly or hostile character or identity of another. (FRA)