For me a 'dungeon' is any locale where the players are expected to deal with a series of encounters in relative close proximity to each other (temporally).Then just about anything that takes place in a physical location counts as a "dungeon crawl" and the words become kind of meaningless. It also probably wouldn't qualify based on wikipedia's definition
A dungeon crawl is a type of scenario in fantasy role-playing games in which heroes navigate a labyrinth environment (a "dungeon"), battling various monsters, avoiding traps, solving puzzles, and looting any treasure they may find. Video games which predominantly feature dungeon crawl elements are considered to be a genre.
It could be a ruin, a cave network, a castle, sewers, trails and clearings in a forest, mines or anything of that nature.
Any time the party are in formation, and moving from area to area dealing with something in that area.
For mine, 'dungeons' take up 50-75 percent of game time, with the rest being mainly upkeep in towns, travel to (and (from) dungeons, and social pillar stuff.