カチオンかちおんFreq.FrequencyTop 100,000Meanings1nouncationchemistryChemistry term for a positively charged ion. Often contrasted with アニオン (anion).See also: 陽イオンナトリウムイオンは代だい表ひょう的てきなカチオンです。The sodium ion is a typical cation.溶よう液えき中ちゅうでカチオンとアニオンに分わかれる。It separates into cations and anions in solution.