0 a playing card that does not have any particular value but that can be used to represent any other card:
1 in computers, a symbol that has no particular meaning of its own so that its space can be filled by any real character that is necessary:
The wild cards are represented here by asterisks.
2 someone who is allowed to take part in a competition, even though they have not achieved this in the usual way, for example by winning games:
Phillips is hoping for a wild card entry to the championships.
3 someone or something whose behaviour is sometimes unexpected:
4 (in some card games) a card that can be used instead of any other:
fig. Undecided voters are this election’s wild card.
5 (in sports) an extra opportunity to qualify for a championship competition
6 someone or something whose behaviour or effect is uncertain:
US consumer confidence remains the wild card in the unpredictable economic climate.
7 a symbol used in computer programs to represent any number or letter:
The wild cards in this string are represented by asterisks.
However, "_" all by itself is a reserved identifier, used as wild card in patterns.
The _ symbol is a wild card which is a convenient denotation for anonymous node identifiers.
The researcher's own therapy allegiances : a ' wild card ' in comparisons of treatment efficacy.
He picked a wild card.
However, one can predict that in a war when people become desperate, the wild card will be played.
This is the wild card which none of our past political philosophers predicted but which has deeply, deeply changed the political map of all modern democracies.
There is also the wild card in the pack, a mystery inquirer exercise, to analyse the quality of the information and service received by businesses from business link.
There is one wild card.
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