That is not a definition of mythology. It's a file folder. "mythology is a collection of myths.' You know, like "Christianity" is the catch all title for all Christian beliefs, or "Archeology" is the catch all title of all the people who investigate what happened in ancient history by examining what people left behind them.
Here is the definition of 'myth.'
Myth;
: a usually traditional story of ostensibly historical events that serves to unfold part of the world view of a people or explain a practice, belief, or natural phenomenon....example,
creation myths
b: PARABLE, ALLEGORY Moral responsibility is the motif of Plato's myths.
Now the second definition, way down at the bottom,
says 'unfounded or false notion," but it's a wise idea to go with definition 1, not 2 b.
At least make sure that you and the person with whom you are discussing things are using the same definition. Otherwise, there's no communication.
Now me, I love mythology. I absolutely do NOT use it to explain the practical and scientific workings of, say, the eruption of Mt. Vesuvius (on my birthday, as it happens). However, the stories that grew up around it, the mythology, is wonderful. It gives us all a valuable insight into how those people saw the world and each other.
...........for instance, were you aware that the vast majority of Pompeians actually survived, were rescued and resettled in places like Capua, etc., on the Emperor's money? That some of them actually attempted to come back and get their belongings by tunneling through the ash,,,and left some graffiti there, like "Sodom and Gomorrah?" Now THAT'S mythology that's 'true.' The only evidence we have that there were Christians or Jews connected to Pompeii, other than, er, 'myth.'
Think about all the stories...the mythology...based around the Trojan War and the burning of the city of Troy. Troy itself is real. It was burned and destroyed. We have established that, and the guy who did used the Iliad to find the city. So SOME of that particular bit of mythology is 'fact.' Perhaps not much, but enough for an archaeologist to find the city, right? That so many wonderful stories came out of that, stories that tell us of the character and beliefs of those people is an added bonus, and for THAT, they are all 'true,' if not precisely factual.
I can't quite see where the Odyssey is factual, or how it can be used to find anything, but hey....the stories are great. My niece named her son Odysseus.
We're still dealing with that. Shortening that name isn't easy. He's going to hate her if he ever runs for office....but never mind that.
Truth about people is often illustrated by stories that are not factual. Do not confuse 'mythology' with 'scientific fact about the physical world,' because it's not. That's not the purpose of myth, even when the myth IS historically or scientifically accurate. Mythology is all about the people who tell the stories, not about whether the stories are scientifically accurate.
It's NICE when mythology is factual, and I'm sure you understand that I believe that more of the Bible (and the Book of Mormon and the Doctrine and Covenants and the Pearl of Great Price) stories are 'fact' than you do, but again, that's not the point of mythology.
At all.