Real Dictionary

-ion in American English
the act or condition of
suffix: a suffix, appearing in words of Latin origin, denoting action or condition, used in Latin and in English to form nouns from stems of Latin adjectives ( communion; union), verbs ( legion; opinion), and esp. past participles ( allusion; creation; fusion; no

-ion in British English
suffix forming nouns: indicating an action, process, or state

ion in American English
an electrically charged atom or group of atoms, the electrical charge of which results when a neutral atom or group of atoms loses or gains one or more electrons during chemical reactions, by the action of certain forms of radiant energy, etc.: the loss o
noun: an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons, as a cation ( positive ion), which is created by electron loss and is attracted to the cathode in electrolysis, or as an anion ( negative ion), which is cr
noun: the eponymous ancestor of the Ionians: a son of Apollo and Creusa who is abandoned by his mother but returns to become an attendant in Apollo's temple at Delphi

ion in British English
noun: an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons

ion in Chemical Engineering
noun: An ion is a particle with a positive or negative charge, which is formed by the loss or gain of electrons (= particles with a negative charge) in an exchange reaction.

Ion. in American English
abbreviation: Ionic