Latin word compleo comes from Latin con-, Latin pleo (To fill, to fulfill.)

Detailed word origin of compleo

Dictionary entry	Language	Definition
con-	Latin (lat)	Used in compounds to indicate a being or bringing together of several objects. Used in compounds to indicate the completeness, perfecting of any act, and thus gives intensity to the signification of the simple word.
pleo	Latin (lat)	To fill, to fulfill.
compleo	Latin (lat)	(of a promise) I fulfil.. (with food or drink) I fill, sate; satisfy.. I cover, overwhelm.. I fill up, fill full, fill out; make up, complete.. I finish, complete.

Words with the same origin as compleo