Latin word complementum comes from Latin complere, Latin instrumentum

Detailed word origin of complementum

Dictionary entry	Language	Definition
complere	Latin (lat)
instrumentum	Latin (lat)	(collective) supply, provision. (general) paraphernalia, equipment. An instrument, tool, utensil. Records, documents.
complementum	Latin (lat)	Complement (that which fills up or completes).

Words with the same origin as complementum