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Ion, in physics and chemistry, an atom or group of atoms with a net electric charge.

Ionic bond, a type of chemical bond involving ions.

Ionic liquid, a liquid that essentially contains only ions.

Ionian Islands, seven Greek islands which lie on the eastern coast of the Ionian Sea.

Ionian Sea, an arm of the Mediterranean Sea, between Greece and Southern Italy.

Ionic order, one of the orders of classical architecture.

Ionians, a people, one of the four great divisions of the ancient Greek people.

Ionia, an ancient region in western Anatolia, in which the Ionian settlers established some colonies.

Ionian Revolt, a revolt by Greek Ionians against the Persian Empire in western Anatolia preceding the Greco-Persian Wars.

Ionic dialect, any of several related dialects in the ancient Greek language.

Ionic numeral system, a certain numeral system with Greek numerals.

Ionic school, in ancient Greek philosophy, founded by Thales of Miletus in Ionia.

Ionian mode, one of the modes in ancient Greek music.