(according to dictionary.com)
1. away from, or not in, the normal or usual place, position, state, etc.: out of alphabetical order; to go out to dinner.
2. away from one’s home, country, work, etc., as specified: to go out of town.
3. in or into the outdoors: to go out for a walk.
4. to a state of exhaustion, extinction, or depletion: to pump a well out.
5. to the end or conclusion; to a final decision or resolution: to say it all out.