well-order noun 1verb 1forms 3 noun1 •A total order of some set such that every nonempty subset contains a least element.̲X is well-order enriched iff every morphism set ̲X(X,Y) carries a well-order ≤_(XY) such that f≨_(XY)g⇒h•f≨_(XY)h•g for every h:Y→Z. — 1986 verb1 •To impose a well-order on (a set).The set of positive integers is well-ordered by the relation ≤. formswell-ordered · well-ordering · well-orders