Definitions

1. adverb

situated at or near the back of a ship, airplane, etc.

“The crew checked the astern view before reversing the ship.”

2. noun

the back part of a ship or airplane.

“The astern of the ship was damaged during the collision.”

3. adjective

relating to or situated at the back of a ship, airplane, etc.

“The astern windows of the plane were fogged up.”