English word -ation comes from Latin -atio ((Vulgar Latin) Form of -tiō appended to nouns.)

Detailed word origin of -ation

Dictionary entry	Language	Definition
-atio	Latin (lat)	(Vulgar Latin) Form of -tiō appended to nouns.
-ation	English (eng)	A state or quality. An action or process. The result of an action or process.

Words with the same origin as -ation