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See also: Ion (disambiguation)

Ionic or Ionian may refer to:

In science:

• 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 compound, a chemical compound in which ions are held together in a lattice structure by ionic bonds
  • Ionic crystal, a crystal consisting of ions bound together by their electrostatic attraction
  • Ionic equation, a chemical equation in which electrolytes are written as dissociated ions
  • Ionic liquid, a liquid that essentially contains only ions
  • Ionic polarization, polarization caused by relative displacements between ions in ionic crystals
  • Ionic potential, the ratio of electric charge to the radius of an ion
  • Ionic radius, a measure of the size of an ion in a crystal lattice
  • Ionic solid, a solid are held together by ionic bonds
  • Ionic strength, a function of the concentration of all ions present in a solution
  • Ionic transfer, the transfer of ions from one liquid phase to another

• The Middle Pleistocene, also known as the Ionian Stage, in geology

In geography:

• 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

In ancient Greece:

• 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
• Ionic Greek, any of several related dialects in the ancient Greek language
• Ionic order, one of the orders of classical architecture
• Ionic numeral system, a certain numeral system with Greek numerals
• Ionian School, in ancient Greek philosophy
• Ionian mode, one of the modes in ancient Greek music

In business:

• Ionian Technologies, a biotechnology company

In shipping history

• RMS Ionic, a steamship ocean liner built for the White Star Line (1883)
• SS Ionic, a steamship ocean liner built for the White Star Line (1902)
• SS Ionic Star, a steamship trading vessel built for the Blue Star Line (1917)

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