What is the meaning of Ion?

An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.

I don't.

ion

an ion

ion (charged atom or compound)

accusative of io

ion

Rōmaji transcription of いおん

Rōmaji transcription of イオン

an ion; an atom or molecule with a net electric charge.

an ion

an ion

ion

ion (atom or group of atoms bearing an electrical charge)

an ion

Source: wiktionary.org