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1a playing card that can have any value, suit, colour, or other property in a game at the discretion of the player holding it.
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Computing a character that will match any character or sequence of characters in a search.
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2an opportunity to enter a sports competition without having to take part in qualifying matches or be ranked at a particular level.
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a player or team given such an opportunity.
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3a person or thing whose influence is unpredictable or whose qualities are uncertain.