adverb

1. in or to the rear or back to walk behind, to look behind
2. at an earlier time; in the past my joy lies behind
3. in a former place, condition, etc. the girl he left behind
4. in or into a retarded state to drop behind in one's studies
5. in or into arrears to fall behind in one's dues
6. slow in time; late the train was running behind
7. Archaic in reserve; yet to come

Etymology: ME bihinden < OE behindan: see be- & hind

1. remaining after the dead leave their wealth behind them
2. 1. in the rear of; in back of he sat behind me
   2. following at the rear of
3. inferior to in position, achievement, etc.
4. later than; delayed with respect to to be behind schedule
5. on the other or farther side of; beyond behind the hill
6. gone by or ended for; out of the attention or concern of his apprenticeship was behind him
7. 1. supporting fans solidly behind their team
   2. prompting or instigating the mastermind behind the plot
8. 1. hidden by; not yet revealed about there's something behind this news
   2. in the circumstances surrounding or antecedent to

adjective

noun