Толковый словарь английского языка Oxford English Reference - ion

suffix (usu. as -sion, -tion, -xion; see -ATION, -ITION, -UTION.) forming nouns denoting: 1 verbal action (excision). 2 an instance of this (a suggestion). 3 a resulting state or product (vexation; concoction). Etymology: from or after F -ion or L -io -ionis ION n. an atom or group of atoms that has lost one or more electrons (= CATION), or gained one or more electrons (= ANION). Phrases and idioms ion exchange the exchange of ions of the same charge between a usu. aqueous solution and a solid, used in water-softening etc. ion exchanger a substance or equipment for this process. Etymology: Gk, neut. pres. part. of eimi go