Latin word prolongo comes from Latin pro-, Latin longior (Farther. Greater. Longer. Remoter.)

Detailed word origin of prolongo

Dictionary entry	Language	Definition
pro-	Latin (lat)	(prefixed to verbs of utterance) in place of, on behalf of. (temporally) prior, fore-. Action directed forward or in front. Advantage. Bringing into being, forth, or into the open. Downward and forward movement. Forward direction, forward movement. Prominence.
longior	Latin (lat)	Farther. Greater. Longer. Remoter.
prolongo	Latin (lat)	I lengthen, prolong or extend.

Words with the same origin as prolongo