early 15c., "a breaking into parts," from L. resolutionem (nom. resolutio) "process of reducing things into simpler forms," from pp. stem of resolvere "loosen" (see resolve). Originally sense of "solving" (as of mathematical problems) first recorded 1540s, that of "holding firmly" (in resolute) 1530s, and that of "decision or expression of a meeting" is from c.1600.