Definition of MYTH

a traditional but unfounded story that gives the reason for a current custom, belief, or fact of nature <according to an ancient Greek myth, humans acquired fire from Prometheus, a Titan who had stolen it from heaven>
Synonyms fable, legend, mythos
the body of customs, beliefs, stories, and sayings associated with a people, thing, or place <over the years Davy Crockett evolved from an actual person to one of the great figures of American myth>

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