Are these good questions? - What does "Dungeon" mean in "Dungeons and Dragons", and how did that meaning come about?

I've also tried to scope stuff out around this on [the English.SE Meta](https://english.meta.stackexchange.com/questions/7071/are-either-of-these-dungeons-and-dragons-related-questions-good-questions) and [Scifi.SE meta](https://scifi.meta.stackexchange.com/questions/7158/has-this-been-asked-before-how-did-dungeon-evolved-to-mean-place-where-adv).

Asked: https://rpg.stackexchange.com/questions/67422/why-do-dd-and-other-rpgs-players-use-dungeon-to-mean-the-places-they-go-to