CATION Meaning of CATION in English [ 'katʌɪən ]■ noun Chemistry a positively charged ion. The opposite of anion .Derivatives~ic katʌɪ'ɒnɪk adjective OriginC19: from cata- or from cathode , + ion . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004