CATION By N., Sam M.S. - 2 n. a positively-charged ion which is characterized as having more protons and fewer electrons. Examples include the sodium ion (Na) and the potassium ion (K). Compare anion. CATION: "A cation is an ion which typically carries a positive charge." Related Psychology Terms EPILEPSY (Etiology and Therapy) ADOLESCENCE (Theories) ANION SODIUM REGULATION NERVE CONDUCTION NURSERY SCHOOL EXPERIENCE HOMOSEXUALITY (Female) Diagnosis and Treatment Planning FUGUE STATE POLARIZATION Cite this page: N., Sam M.S., "CATION," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/cation/ (accessed January 24, 2022).