Assimilation. The process of integrating outer objects (persons, things, ideas, values) and unconscious contents into consciousness.
Assimilation is the approximation of a new content of consciousness to already constellated subjective material . . . . Fundament-ally, [it] is a process of apperception, but is distinguished from apperception by this element of approximation to the subjective material. . . . I use the term assimilation . . . as the approximation of object to subject in general, and with it I contrast dissimilation, as the approximation of subject to object, and a consequent alienation of the subject from himself in favour of the object, whether it be an external object or a "psychological" object, for instance an idea.["Definitions, "CW 6, pars. 685f.]