astern UK /əˈstɜːn/US /əˈstɝn/adverb 3adjective 1preposition 1forms 2 adverb3 •In the direction of the stern; backward (motion); to the rear. •Behind (a vessel); in the rear.After we had row'd, or rather driven about a League and a Half, as we reckon'd it, a raging Wave, Mountain-like, came rowling a-stern of us, and plainly bad us expect the Coup-de-Grace. — 1719 •(no longer used, rare) At or toward the rear of a vessel. adjective1 •Behind a vessel; having a bearing of 180 degrees from ahead.If one ship is following another, the first is astern of the second. preposition1 •Behind (a vessel); in the rear.[…]a flock of eight appeared, and alighting on a rope astern the ship, remained there for nearly an hour — 1841 formsmore astern · most astern