n. A going back or inward; relapse.n. In medicine, the disappearance or metastasis of a tumor, an eruption, etc., from the surface of the body inward.n. A sloping backward; a backward inclination or progression; a retreating outline, form, or position.n. The act of retroceding or giving back; in Scots law, the reconveyance of any right by an assignee back to the assignor, who thus recovers his former right by becoming the assignee of his own assignee.n. In geometry, inflection.n. In civil law, a reconveyance of heritable rights to the original grantor.