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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.
An easy way to remember that cations are positive ions is by replacing the 't' in 'cation' with a positive sign, +. Instead of writing cation, you would write ca+ion. The positive sign bears enough likeness to a 't' to be read as cation, yet it reminds you of the definition!