abaft[ə baft′, -bäft′]
abaft definition by Webster's New World
Origin: Middle English o baft ; from Old English on, on plush bæftan ; from be, by plush æftan, aft
abaft definition by American Heritage Dictionary
Origin: Middle English on baft : on, at; see on + baft, to the rear (from Old English beǽftan, behind : be, by, at; see ambhi in Indo-European roots + ǽftan, behind; see apo- in Indo-European roots).