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addition

[uh-dish-uh n] /əˈdɪʃ ən/
noun
1.
the act or process of adding or uniting.
2.
the process of uniting two or more numbers into one sum, represented by the symbol +.
3.
the result of adding.
4.
something added.
5.
a wing, room, etc., added to a building, or abutting land added to real estate already owned.
6.
Chemistry. a reaction in which two or more substances combine to form another compound.
Idioms
7.
in addition to, as well as; besides:
In addition to directing the play, she designed most of the scenery.
Origin
1350-1400
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 forms
preaddition, noun
readdition, noun
Can be confused
addition, edition.
Synonyms
1. joining. 3, 4. increase, enlargement; increment; accession, 4. supplement; appendix. 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 Dictionary, © Random House, Inc. 2014.
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Examples from the web for in addition to
  • in addition to the recipe ingredients, you'll need the following.
  • in addition to being used as mixing bowls, the abalone shells served as storage containers.
  • in addition to exhibit descriptions, docents are on hand to expand on posted descriptions.
  • Probably, other personal references were intended in addition to those indicated, but they are not discernible now.
  • in addition to these there are sometimes present an ascending and a descending mesocolon.
  • If the committee is to be a special one, it is necessary in addition to its number to decide how it is to be appointed.
  • Symbolism is a second and independent item of dream distortion, in addition to dream censorship.
  • in addition to the tympanic plexus there are the nerves supplying the muscles.
  • Because, in addition to his desire to say it straight out, he is actuated by strong opposite motives.
  • in addition to awe and envy, its rise has spawned a rapidly growing list of trade quarrels.
British Dictionary definitions for in addition to

addition

/əˈdɪʃən/
noun
1.
the act, process, or result of adding
2.
a person or thing that is added or acquired
3.
a mathematical operation in which the sum of two numbers or quantities is calculated. Usually indicated by the symbol +
4.
(mainly US & Canadian) a part added to a building or piece of land; annexe
5.
(obsolete) a title following a person's name
6.
(adverb) in addition, also; as well; besides
7.
(preposition) in addition to, besides; as well as
Word Origin
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
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Word Origin and History for in addition to

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
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in addition to in Science
addition
  (ə-dĭsh'ən)   
The act, process, or operation of adding two or more numbers to compute their sum.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Idioms and Phrases with in addition to

addition

The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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2
3
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