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

  • n. The act or process of adding, especially the process of computing with sets of numbers so as to find their sum.
  • n. Something added, such as a room or section appended to a building.
  • idiom in addition Also; as well.
  • idiom in addition to Over and above; besides.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The act of adding anything.
  • n. Anything that is added.
  • n. The arithmetic operation of adding.

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of adding two or more things together; -- opposed to subtraction or diminution.
  • n. Anything added; increase; augmentation.
  • n. That part of arithmetic which treats of adding numbers.
  • n. A dot at the right side of a note as an indication that its sound is to be lengthened one half.
  • n. A title annexed to a man's name, to identify him more precisely.; Richard Roe, Gent.; Robert Dale, Mason; Thomas Way, of New York; a mark of distinction; a title.
  • n. Something added to a coat of arms, as a mark of honor; -- opposed to abatement.

from The Century Dictionary and Cyclopedia

  • To furnish with an addition, or a designation additional to one's name.
  • To combine; add together.
  • n. The act or process of adding or uniting, especially so that the parts remain independent of one another: opposed to subtraction or diminution: as, a sum is increased by addition; to increase a heap by the addition of more.
  • n. The result of adding; anything added, whether material or immaterial.
  • n. Specifically— In law, a title or designation annexed to a man's name to show his rank, occupation, or place of residence: as, John Doe, Esq.; Richard Roe, Gent.; Robert Dale, Mason; Thomas Way, of Boston, Hence—
  • n. An epithet or any added designation or description: a use frequent in Shakspere, but now obsolete.
  • n. In music, a dot at the side of a note indicating that its sound is to be lengthened one half.
  • n. In heraldry, same as augmentation.
  • n. In distilling, anything added to the wash or liquor when in a state of fermentation.
  • n. Superaddition, appendage, adjunct, increase, increment, extension, enlargement, augmentation.

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

  • n. a quantity that is added
  • n. a suburban area laid out in streets and lots for a future residential area
  • n. a component that is added to something to improve it
  • n. the act of adding one thing to another
  • n. something added to what you already have
  • n. the arithmetic operation of summing; calculating the sum of two or more numbers


Middle English, from Old French, from Latin additiō, additiōn-, from additus, past participle of addere, to add; see add.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Sense of “what is added” dating from 14th Century CE; from Old French adition ("increasement"), from Latin additiōnem, accusative singular of additio. (Wiktionary)



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