- perpetual
- mid-14c., from O.Fr. perpetuel (12c.), from L. perpetualis "universal," in M.L. "permanent," from perpetuus "continuous, universal," from perpetis, gen. of Old L. perpes "lasting," probably from per- "through" + root of petere "to seek, go to, aim at" (see petition). Perpetual motion is attested from 1590s.