-ion

[Sarah]

A noun suffix denoting act, process, result of an act or aprocess, thing acted upon, state, or condition; as, revolution, theact or process of revolving; construction, the act or process ofconstructing; a thing constructed; dominion, territory ruled over;subjection, state of being subject; dejection; abstraction.

[Dorothey Allen]

an atom or small group of atoms that has an electrical charge because it has added or lost one or more electrons