| 1. | Cards. a card having its value decided by the wishes of the players. |
| 2. | a determining or important person or thing whose qualities are unknown, indeterminate, or unpredictable: In a sailboat race the weather is the wild card. |
| 3. | Tennis. a player, usually without ranking, who is allowed to enter a tournament at the discretion of the tournament committee after regularly qualifying competitors have been selected. |
[wahyld-kahrd] 
| 1. | of, constituting, or including a wild card. |
| 2. | Informal. of, being, or including an unpredictable or unproven element, person, item, etc. |
| 3. | Sports. of, being, or including an unseeded or unproven participant or team, as a team in a championship tournament that has not placed first in its league or area. |
| wild·card or wild card (wīld'kärd') n.
|
wild card operating system, programming, text
(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)
wild card
An unpredictable person or event, as in Don't count on his support
he's a wild card, or A traffic jam? That's a wild card we didn't expect. This expression comes from card games, especially poker, where it refers to a card that can stand for any rank chosen by the player who holds it. The term was adopted in sports for an additional player or team chosen to take part in a contest after the regular places have been taken. It is also used in computer terminology for a symbol that stands for one or more characters in searches for files that share a common specification. Its figurative use dates from the mid-1900s.