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

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

Rōmaji transcription of いおん

Rōmaji transcription of イオン

an ion

an ion

ion

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

an ion

Source: wiktionary.org