behind

behind is a Preposition

Definition:

[1] 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. A tall Brabanter, behind whom I stood. Bp. Hall.

[2] Left after the departure of, whether this be by removing to a distance or by death. A small part of what he left behind him. Pope.

[3] Left a distance by, in progress of improvement Hence: Inferior to in dignity, rank, knowledge, or excellence, or in any achievement. I was not a whit behind the very chiefest apostles. 2 Cor. xi. 5.