Available Definitions:
1) a. - On the side opposite the front or nearest part; on the back side of; at the back of; on the other side of; as, behind a door; behind a hill.
2) a. - Left after the departure of, whether this be by removing to a distance or by death.
3) a. - Left a distance by, in progress of improvement Hence: Inferior to in dignity, rank, knowledge, or excellence, or in any achievement.
4) adv. - At the back part; in the rear.
5) adv. - Toward the back part or rear; backward; as, to look behind.
6) adv. - Not yet brought forward, produced, or exhibited to view; out of sight; remaining.
7) adv. - Backward in time or order of succession; past.
8) adv. - After the departure of another; as, to stay behind.
9) n. - The backside; the rump.