at or toward the rear of: Look behind the house.
not keeping up with, later than; after: behind schedule.
in the state of making less progress than: We can't afford to fall behind our competitors.
on the farther side of; beyond: behind the mountain.
originating, supporting, or promoting: Who's behind this program?
hidden or unrevealed by: Malice lay behind her smile.
at the controls of: behind the wheel of a car.
at or toward the rear; rearward: to lag behind.
in a place, state, or stage already passed.
in arrears; behindhand: to be behind in one's rent.
slow, as a watch or clock: more than 20 minutes behind.
as a cause or often latent feature of: Behind their harassment lay the traditional fear of foreigners.
in a situation that exists afterward: The victim left behind a large family.
Archaic. in reserve; to come: Greater support is yet behind.
following: the man behind.
Informal. the buttocks.

before 900; Middle English behinde(n), Old English behindan; for adv. suffix -an cf. before. See be-, hind1

1, 2. Behind, after both refer to a position following something else. Behind applies primarily to position in space, and suggests that one person or thing is at the back of another; it may also refer to (a fixed) time: He stood behind the chair. You are behind the appointed time. After applies primarily to time; when it denotes position in space, it is not used with precision, and refers usually to bodies in motion: Rest after a hard day's work. They entered the room, one after another.

See back1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
behind (bɪˈhaɪnd)
1.  in or to a position further back than; at the rear of; at the back of
2.  in the past in relation to: I've got the exams behind me now
3.  late according to; not keeping up with: running behind schedule
4.  concerning the circumstances surrounding: the reasons behind his departure
5.  backing or supporting: I'm right behind you in your application
6.  in or to a position further back; following
7.  remaining after someone's departure: he left it behind
8.  in debt; in arrears: to fall behind with payments
9.  (postpositive) in a position further back; retarded: the man behind prodded me
10.  informal the buttocks
11.  Australian rules football a score of one point made by kicking the ball over the behind line between a goalpost and one of the smaller outer posts (behind posts)
[Old English behindan]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. behindan "behind, after," from bi "by" + hindan "from behind" (see hind (adj.)). Euphemistic meaning "backside of a person" is from 1786. Phrase behind the times is from 1905.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Many evolutionists support some version of intelligence behind all the
  complexity and design in the world.
The idea behind two-tier wage programs is to stretch out the progression
  between tenure and wages.
Today you cannot order a coffee, buy a bagel, or pay for a photocopy without
  being asked to leave your change behind for.
Parking is concentrated alongside curbs, in lots behind shops, and in garages
  off rear alleys.
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