Definitions from Wiktionary (wildcard)

▸ noun:  (computing) A character that takes the place of any other character or string that is not known or specified.
▸ noun:  (also written wild card) An uncontrolled or unpredictable element.
▸ noun:  (also written wild card) An element, often deliberately concealed, which is withheld for contingency.
▸ noun:  (phonetics, phonology) A letter or symbol that substitutes for a generic or poorly identified sound, for example capital C for any or some consonant, or capital V for any or some vowel.
▸ verb:  (computing) To replace or supplement with a wildcard character to allow matching against a range of possible values.
▸ noun:  (sports, card games) Alternative form of wild card. [(card games) A card that can be assigned any value or used to substitute for any needed card.]

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