early 15c., "fullness, completeness, perfection," from Old French plenitude and directly from Latin plenitudinem (nominative plenitudo) "abundance, completeness, fullness," from plenus "full, filled, greatly crowded; stout, pregnant; abundant, abounding; complete," from PIE root *pele- (1) "to fill." Related: Plenitudinary.
Pleistocene
pleistodox
*plek-
plenary
plenipotentiary
plenitude
plenteous
plentiful
plentitude
plenty
plenum