Meanings
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1
adv
at, near, or toward the stern of a ship
The passengers moved abaft as the crew cleared the forward deck.
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2
prep
behind another point or object when viewed toward a vessel's stern
The spare ropes were stored abaft the mainmast.
Thesaurus
Etymology
From Middle English abaft and baft, ultimately from Old English beæftan ("behind"), formed from be ("by") + æftan ("behind"). It survives chiefly as a nautical direction word.