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Definition of Wild card
1. Noun. An unpredictable factor. "The weather was a wild card"
Generic synonyms: Factor
2. Noun. A playing card whose value can be determined by the person who holds it.
Generic synonyms: Playing Card
Definition of Wild card
1. Noun. In card games, a card that can be assigned any value or used to substitute for any needed card. ¹
2. Noun. (sports) A competitor or team that is allowed to compete in a tournament despite not reaching the normal standards to qualify for inclusion. ¹
3. Noun. (computing) a character that substitutes for other characters in regular expressions and globbing ¹
¹ Source: wiktionary.com