Definitions

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

  • n. The act or an instance of emitting.
  • n. Something emitted.
  • n. A substance discharged into the air, especially by an internal combustion engine.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. That which is emitted or sent out.
  • n. The act of sending or throwing out; the act of sending forth or putting into circulation; issue.

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of sending or throwing out; the act of sending forth or putting into circulation; issue
  • n. That which is sent out, issued, or put in circulation at one time; issue.

from The Century Dictionary and Cyclopedia

  • n. The act of emitting, or of sending or throwing out; a putting forth or issuing: as, the emission of light from the sun or other luminous body; the emission of steam from a boiler; the emission of paper money.
  • n. That which is emitted, or sent or thrown out.
  • n. Specifically— In finance, an amount or quantity of any representative of value issued or put into circulation; an issue: as, the entire emission (of coin, bank-notes, or the like) has been called in or redeemed; the first, second and third emissions of United States notes issued during the civil war.
  • n. In physiology, a discharge, especially an involuntary discharge, of semen.

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

  • n. the occurrence of a flow of water (as from a pipe)
  • n. the act of emitting; causing to flow forth
  • n. the release of electrons from parent atoms
  • n. any of several bodily processes by which substances go out of the body
  • n. a substance that is emitted or released

Etymologies

Latin ēmissiō, ēmissiōn-, a sending out, from ēmissus, past participle of ēmittere, to send out; see emit.
(American Heritage® Dictionary of the English Language, Fourth Edition)
First attested in 1607. Borrowing from Latin ēmissiō ("sending forth") (also possibly influenced by Middle French emission from the same Latin source) from ēmittō ("send out"), from ex ("from, out of") + mittō ("send"). (Wiktionary)

Examples

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