n. That act of the mind by which it becomes conscious of its ideas as its own; perception (which see) with the added consciousness that it is “I” who perceive.n. Hence, by a slight modificationn. With Kant and most English writers, an act of voluntary consciousness, accompanied with self-consciousness: especially in the phrase pure apperception.n. In the psychology of Herbart (1776–1841), the coalescence of the remainder of a new isolated idea with an older one, by a modification of one or the other.n. Apprehension; recognition.n. In Wundt's psychology, the process whereby a perception or idea attains to clearness in consciousness; also, the introspective contents of this process, that is, the clear idea itself and the changes resulting in consciousness from the induction of the attentive state.