In Greek, muthos is anything delivered by word of mouth, word, or speech; a speech in the public assembly; talk or conversation; counsel or advice, a command, an order, and also a promise; the subject of speech, or the thing or matter itself; a resolve, purpose, design, or plan; a saying or proverb; the talk of men, and thus rumor.

muthos ~ mythos ~ mythus ~ myth is a tale, a story, or a narrative; a traditional or recurrent narrative theme or pattern; a standard plot in literature; or a traditional story providing an explanation for or embodying a popular idea concerning some natural or social phenomenon or some religious belief or ritual.

And a myth may be an idealized or exaggerated, or even (though not necessarily) a completely misrepresented, conception.

Myth is a legendary or stylized narrative, usually of a theme that expresses the ideology of a culture.

Myth is a way the unknowable can be understood ~ a device to think with, i.e. a way in which reality is classified and organized. And myth is a type of speech, so that everything can be a myth provided it is conveyed by a discourse.

The Vedas are pure Mythology!