essentiate

To constitute or form the being or essence of (someone or something).

That a number of Self-essentiated Deities plainly takes away the Being of the true God.

[I]f Mr. [René] Des Cartes’s notion be admitted, it vvill be irrational to admit a vacuum, ſince any ſpace, that is pretended to be empty, muſt be acknovvledged to have the three dimenſions, and conſequently all, that is neceſſary to essentiate a body: […]

To become assimilated.