an act or instance of combining into an integral whole.
an act or instance of integrating a racial, religious, or ethnic group.
an act or instance of integrating an organization, place of business, school, etc.
Mathematics. the operation of finding the integral of a function or equation, especially solving a differential equation.
behavior, as of an individual, that is in harmony with the environment.
Psychology. the organization of the constituent elements of the personality into a coordinated, harmonious whole.
Genetics. coadaptation ( def 2 ).

1610–20; integrate + -ion; compare Latin integrātiō renewal

anti-integration, adjective
de-integration, noun
nonintegration, noun
prointegration, adjective
self-integration, noun

1. combination, blending, fusing. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
integration (ˌɪntɪˈɡreɪʃən)
1.  the act of combining or adding parts to make a unified whole
2.  the act of amalgamating a racial or religious group with an existing community
3.  the combination of previously racially segregated social facilities into a nonsegregated system
4.  psychol organization into a unified pattern, esp of different aspects of the personality into a hierarchical system of functions
5.  the assimilation of nutritive material by the body during the process of anabolism
6.  maths an operation used in calculus in which the integral of a function or variable is determined; the inverse of differentiation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1610s, from L. integrationem, noun of action from integrare (see integrate). Anti-discrimination sense is recorded from 1940.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

integration in·te·gra·tion (ĭn'tĭ-grā'shən)

  1. The state of combination or the process of combining into completeness and harmony.

  2. The organization of the psychological or social traits and tendencies of a personality into a harmonious whole.

  3. A physiological increase or building up, as by accretion or anabolism.

  4. A recombination event in which a genetic element is inserted.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
integration   (ĭn'tĭ-grā'shən)  Pronunciation Key 
In calculus, the process of calculating an integral. Integration is the inverse of differentiation, since integrating a given function results in a function whose derivative is the given function. Integration is used in the calculation of such things as the areas and volumes of irregular shapes and solids. Compare differentiation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

integration definition

The free association of people from different racial and ethnic backgrounds (see ethnicity); a goal of the civil rights movement to overcome policies of segregation that have been practiced in the United States.

Note: Those favoring integration of schools by such forceful means as busing or affirmative action have frequently argued that integration of schools will lead to integration of society as a whole. (See separate but equal.)
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

integration definition

Combining software or hardware components or both into an overall system.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
It's a great example of integration of architecture and landscape.
Research is beginning to show that media integration can be an effective tool
  for moving people to awareness and then to action.
His integration of high-end manufacture with a higher purpose is widely admired
  among his colleagues in the fashion industry.
There he was able to develop his directorial style, which focusses on the
  integration of performers and theatrical space.
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