mid-15c., Scottish, "postpone, defer," from M.Fr. superceder
"desist, delay, defer," from L. supersedere
"sit on top of, stay clear of, abstain from, forbear, refrain from," from super
"above" (see super-
) + sedere
"to sit" (see sedentary
). In Scottish law, a judicial order protecting a debtor. Meaning "displace, replace" first recorded 1640s.