Meaning of ION in English

[ion] n [Gk, neut. of ion, prp. of ienai to go--more at issue] (ca. 1834) 1: an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons

2: a charged subatomic particle (as a free electron)

Merriam-Webster English vocab.      Английский словарь Merriam Webster.