addition

[uh-dish-uhn]
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noun

the act or process of adding or uniting.
the process of uniting two or more numbers into one sum, represented by the symbol +.
the result of adding.
something added.
a wing, room, etc., added to a building, or abutting land added to real estate already owned.
Chemistry. a reaction in which two or more substances combine to form another compound.

Nearby words

  1. addison, joseph,
  2. addison, thomas,
  3. addisonian,
  4. addisonian crisis,
  5. additament,
  6. addition compound,
  7. addition polymer,
  8. addition polymerization,
  9. addition polymers,
  10. addition reaction

Idioms

    in addition to, as well as; besides: In addition to directing the play, she designed most of the scenery.

Origin of addition

1350–1400; Middle English addicio(u)n < Latin additiōn- (stem of additiō), equivalent to addit(us), past participle of addere to add (ad- ad- + di- put + -tus past participle suffix) + -iōn- -ion

Related formspre·ad·di·tion, nounre·ad·di·tion, noun

Can be confusedaddition edition

Synonym study

4. Addition, accessory, adjunct, attachment mean something joined onto or used with something else. Addition is the general word, carrying no implication of size, importance, or kind, but merely that of being joined to something previously existing: an addition to an income, to a building, to one's cares. An accessory is a subordinate addition to a more important thing, for the purpose of aiding, completing, ornamenting, etc.: accessories to a costume. An adjunct is a subordinate addition that aids or assists a main thing or person but is often separate: a second machine as an adjunct to the first. An attachment is an accessory part that may be easily connected and removed: a sewing machine attachment for pleating.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for addition


British Dictionary definitions for addition

addition

noun

the act, process, or result of adding
a person or thing that is added or acquired
a mathematical operation in which the sum of two numbers or quantities is calculated. Usually indicated by the symbol +
mainly US and Canadian a part added to a building or piece of land; annexe
obsolete a title following a person's name
in addition (adverb) also; as well; besides
in addition to (preposition) besides; as well as

Word Origin for addition

C15: from Latin additiōn-, from addere to add

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for addition

addition

n.

late 14c., "action of adding numbers;" c.1400, "that which is added," from Old French adition "increase, augmentation" (13c.), from Latin additionem (nominative additio) "an adding to, addition," noun of action from past participle stem of addere (see add). Phrase in addition to "also" is from 1681.

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for addition

addition

[ə-dĭshən]

The act, process, or operation of adding two or more numbers to compute their sum.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with addition

addition

see in addition.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.