preposition
At or to the back or far side of.
Less forward or advanced than; after.
Responsible for, being the creator or controller of.
Underlying, being the reason for or explanation of.
In support of.
(sometimes regarded as nonstandard, US, informal) Following, subsequent to; as a result or consequence of; because of.
adverb
At or in the rear or back part of something.
In a rearward direction.
So as to come after someone or something in position, distance, advancement, ranking, time, etc.
So as to be still in place after someone or something has departed or ceased to exist.
Backward in time or order of succession; past.
Behind the scenes in a theatre; backstage.
(archaic) Not yet brought forward, produced, or exhibited to view; out of sight; remaining.
adjective
Not advanced to the required or expected degree; overdue or in arrears.
(of a watch or clock) Slow.
noun
The rear, back-end.
(informal) The buttocks, bottom, butt.
(Australian rules football) A one-point score.
(baseball, slang, 1800s) The catcher.
In the Eton College field game, any of a group of players consisting of two "shorts" (who try to kick the ball over the bully) and a "long" (who defends the goal).