French word fonction comes from Latin fungor

Detailed word origin of fonction

Dictionary entry	Language	Definition
fungor	Latin (lat)	I finish (something), complete (something), end (something). I perform, execute, administer, discharge, observe.
functus	Latin (lat)
functionem	Latin (lat)
fonction	French (fra)	(mathematics) A function. A function (what something does or is used for). Role (function or position of something or someone).

Words with the same origin as fonction