- Adjective. Relating to the Hellenic people of that name.
- Adjective. Ionic, of Ionia, the ancient (ca 1100 BC) region including western Asia Minor and the adjacent Aegean Islands occupied by the Ionian people.
- Adjective. Relating to Io, one of the moons of the planet Jupiter.
- Noun. A member of the Ionians, one of the races of Ancient Greece.