This got me thinking of when you make a custom class in OB, they always called it adventurer. (I can't remember if MW does it). My group of friends were talking, and we all have some different ideas of what an adventurer is.
One of my friends thinks of the quest loving warrior, going from place to place looking something to do. Tribe of goblins giving a town trouble? Taste my Blade!
The other one thought of someone who would do anything for some coin. Need me to defeat a cave full of grues? Better be some damn good pay.
Personally, I see it as a jack-off-all, master-of-none type person. Going wherever life takes him, occassionaly getting caught in a sh*tstorm every once in a while, using/learning what skills he needs to.
I noticed that we all, more or less, described our main characters.
I guess thats why Beth chose that title, its so vague that it can mean pretty much anything you want it to.