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Noun. 1. cation-a positively charged ion. hydrogen ion-a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus. ion-a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons.
If the ion is formed by a loss of electrons, a positive charge is developed, and if it is formed by a gain of electrons, then a negative charge is imparted to the particle. The process of generation of ions is called ionization. Cation. A cation is an ion with a net positive charge on it.