1. An unexpected, exciting, and/or risky undertaking where the outcome is unknown.
EX. Every day is an adventure. Today, I'm going to be discussing the next RPG campaign with my friends and I have no clue how this will wind up in the end. One friend wants to play my viking campaign with 4th Edition or Pathfinder, another friend will probably want to play in my old campaign setting Felterra, and yet another may wish to play Call of Cthulu or Ironclaw. I won't know until it happens.
"It's a dangerous business, Frodo, going out your door. You step onto the road, and if you don't keep your feet, there's no knowing where you might be swept off to.” ~ J.R.R. Tolkein