Wild-card meaning

A card that has been declared wild.
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Any of the teams, other than those that finish in first and sometimes second place, that qualify for a championship playoff.
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An element that cannot be predicted or controlled.
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In card games, a card that can be assigned any value or used to substitute for any needed card.
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(sports) A competitor or team that is allowed to compete in a tournament despite not reaching the normal standards to qualify for inclusion.

Kye Sun-Hui won an Olympic gold medal in Judo, despite being a wild card.

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(computing) A character that substitutes for other characters in regular expressions and globbing.
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