A Quick and Simple Dictionary

challenge

1. Noun.  An instigation or antagonization intended to convince a person to perform an action they otherwise would not.
2. Noun.  A difficult task, especially one that the person making the attempt finds more enjoyable because of that difficulty.
3. Noun.  (legal, rare) A judge's interest in the result of the case for which he or she should not be allowed to sit the case, e.g. a conflict of interest.
4. Noun.  (legal) The act of appealing a ruling or decision of a court of administrative agency.
5. Noun.  (legal) The act of seeking to remove a judge, arbitrator or other judicial or semi-judicial figure for reasons of alleged bias or incapacity.
6. Noun.  (sports) An attempt to take possession; a tackle.
7. Verb.  To invite someone to take part in a competition.
8. Verb.  To dare someone.
9. Verb.  To dispute something.
10. Verb.  (legal) To make a formal objection to a juror.