the act of placing together or bringing into proximity; juxtaposition.
the addition or application of one thing to another thing.
Grammar. a syntactic relation between expressions, usually consecutive, that have the same function and the same relation to other elements in the sentence, the second expression identifying or supplementing the first. In Washington, our first president, the phrase our first president is in apposition with Washington.
Biology. growth of a cell wall by the deposition of new particles in layers on the wall. Compare intussusception ( def 2 ).

1400–50; late Middle English apposicioun < Late Latin appositiōn- (stem of appositiō) < Latin apposit(us) (see apposite) + -iōn- -ion

appositional, adjective
appositionally, adverb

apposition, opposition. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
apposition (ˌæpəˈzɪʃən)
1.  a putting into juxtaposition
2.  a grammatical construction in which a word, esp a noun phrase, is placed after another to modify its meaning
3.  biology Compare intussusception growth in the thickness of a cell wall by the deposition of successive layers of material

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"application" of one thing to another, 1540s, from L. appositionem (nom. appositio), noun of action from apponere "to put to" (see apposite).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

apposition ap·po·si·tion (āp'ə-zĭsh'ən)

  1. The putting in contact of two parts or substances.

  2. The condition of being placed or fitted together.

  3. The growth of successive layers of a cell wall.

ap'po·si'tion·al adj.
ap'po·si'tion·al·ly adv.
The American Heritage® Stedman's Medical Dictionary
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