Medical Definition of integration
: the combining and coordinating of separate parts or elements into a unified whole: asa: coordination of mental processes into a normal effective personality or with the individual's environment <failure of association and failure of integration take place among neurotic individuals—R. M. Dorcus & G. W. Shaffer>b: the process by which the different parts of an organism are made a functional and structural whole especially through the activity of the nervous system and of hormones
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