Definitions from Wiktionary (wild card)

▸ noun:  (card games) A card that can be assigned any value or used to substitute for any needed card.
▸ noun:  (sports) A competitor or team that is allowed to compete in a tournament despite not reaching the normal standards to qualify for inclusion.
▸ noun:  (computing) Alternative form of wildcard (“substituted text character”) [(computing) A character that takes the place of any other character or string that is not known or specified.]
▸ noun:  (phonetics, phonology) Alternative form of wildcard (“symbol for a generic sound”) [(computing) A character that takes the place of any other character or string that is not known or specified.]

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