Opposite of assimilation; i.e., radiation, dispersion, etc.
Keely
"The earth's rotation excites and disturbs the equilibrium of the three sympathetic streams, of which the material manifestations are the three forms of electricity. The alternate light and darkness assists in preserving their activity through disturbance of equilibrium, with consequent "dissimilation" (radiation) and "assimilation" (absorption). The dark zone, following the light zone, holds the fluctuations of the polar power constant. This is the tortoise mentioned in the fable, upon which the world rests." [FORCES CONTROLLING THE EARTH]