disassimilation

noun2

1. •
   The act of becoming less assimilated or integrated, particularly of ethnic groups.

   • Judging from the autobiographical texts of these three authors, Natives often mixed assimilation with a degree of disassimilation. — 2004
2. •
   (no longer used) catabolism (metabolism with the release of energy)

   • It shows that the brain is not important to the proper performance of the functions of assimilation and disassimilation—or those of organic life. — 1851