a person who believes in, supports, or works for social integration.
pertaining to, favoring, or being conducive to social integration.

1950–55; integration + -ist 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
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Example sentences
Nothing will now do but to make perfect the reach and scale of this integrationist disaster.
Commitment to the integrationist ideal permeated every aspect of the organization.
He was a lifelong integrationist, but the nonviolent civil rights movement was not for him.
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