Wildcard Definition

noun
A playing card whose value can vary as determined by its holder.
American Heritage
An athlete or team selected to compete in a tournament or playoff from among those who did not qualify by meeting the regular requirements.
American Heritage
A symbol that stands for one or more unspecified characters, used especially in searching text and in selecting multiple files or directories.
American Heritage
An unpredictable or unforeseeable factor.
A surprise witness proved to be the wild card at the trial.
American Heritage

(computing) A character that takes the place of any other character or string that is not known or specified.

In searching, if a*m finds amalgam, atom and alum, then * is acting as a wildcard.
Wiktionary

Other Word Forms of Wildcard

Noun

Singular:
wildcard
Plural:
wildcards

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