1520s, from Anglo-Fr. abeiance "suspension," also "expectation (especially in a lawsuit)," from O.Fr. abeance "aspiration, desire," noun of condition of abeer "aspire after, gape" from à "at" + ba(y)er "be open," from L. *batare "to yawn, gape" (see abash). Originally in O.Fr. a legal term, "condition of a person in expectation or hope of receiving property;" it turned around in Eng. law to mean "condition of property temporarily without an owner" (1660). Root baer is also the source of English bay (2) "recessed space," as in "bay window."