Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Two electrons functioning or regarded as functioning in concert, especially two electrons that form a nonpolar covalent bond between atoms.
  • n. The combination of an electron and a positron as produced by a high-energy photon.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Two electrons having opposite spin but all other quantum numbers the same; i.e two electrons in the same atomic orbital or molecular orbital, especially such electrons that function in concert to form a covalent bond

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