Definitions

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

  • n. A sequence of DNA that codes information for protein synthesis that is transcribed to messenger RNA.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An officer of the Queen's Body Guard of the Yeomen of the Guard.
  • n. A region of a transcribed gene present in the final functional RNA molecule.

from the GNU version of the Collaborative International Dictionary of English

  • n. A native or inhabitant of Exeter, in England.
  • n. An officer of the Yeomen of the Guard; an Exempt.

from The Century Dictionary and Cyclopedia

  • n. In England, the name given to each of four officers of the yeomen of the royal body-guard; an exempt.
  • n. A native or inhabitant of Exeter, England.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. sequence of a gene's DNA that transcribes into protein structures

Etymologies

ex(pressed) + -on1.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Apparently an attempt to express the pronunciation of French exempt. (Wiktionary)
From Latin ex (out) + -on; intended to be distinguished from intron. (Wiktionary)

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