Main entry: aft
Definition: (nautical, aeronautical) situated at or toward the stern or tail
Antonyms: fore
Definition: situated at or toward the bow of a vessel
Main entry: astern, abaft, aft
Definition: at or near or toward the stern of a ship or tail of an airplane
Usage: 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