noun
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(derogatory) A person with poor judgment or little intelligence.
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(historical) A jester; a person whose role was to entertain a sovereign and the court (or lower personages).
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(literature) A stock character typified by unintelligence, naïveté or lucklessness, usually as a form of comic relief; often used as a source of insight or pathos for the audience, as such characters are generally less bound by social expectations.
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Someone who has been made a fool of or tricked; dupe.
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(informal) Someone who derives pleasure from something specified.
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(slang, chiefly African-American Vernacular, Hispanic) An informal greeting akin to buddy, dude, or man.
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(tarot, often capitalized Fool) A particular card in a tarot deck, representing a jester.