|1.||[ pronoun ] preposition, to the rear of|
"He went behind a bush."
|2.||[ pronoun ] preposition, on the other side, temporally or spacially|
"He went behind the store." "After dawn the birds start to sing." "She went out after me."
|3.||[ adverb ] (nautical) at or near or toward the stern of a ship or tail of an airplane|
"stow the luggage aft" "ships with square sails sail fairly efficiently with the wind abaft" "the captain looked astern to see what the fuss was about"