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2 definitions found
 for wild card
From WordNet (r) 3.0 (2006) :

  wild card
      n 1: an unpredictable factor; "the weather was a wild card"
      2: a playing card whose value can be determined by the person
         who holds it

From The Free On-line Dictionary of Computing (18 March 2015) :

  wild card
  
      (From card games in
     which certain cards, often the joker, can act as any other
     card) A special character or character sequence which matches
     any character in a string comparison, like ellipsis ("...") in
     ordinary written text.
  
     In Unix filenames '?' matches any single character and '*'
     matches any zero or more characters.  In regular
     expressions, '.' matches any one character and "[...]"
     matches any one of the enclosed characters.
  
     See also Backus-Naur Form.
  
     (1997-07-16)
  

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