IPA: /ˌæpərˈsɛpʃən/
KK: /æpərˈsɛpʃən/
The process of understanding something by relating it to what you have experienced before, involving full awareness and conscious perception.
Her apperception of the artwork was influenced by her previous experiences with similar styles.
Apperception is formed from "ad-" (meaning to) and "percipere" (meaning to perceive). The word describes the process of perceiving something in relation to previous knowledge or experience, thus integrating new information with what is already known.
Think of 'perceiving' ('percipere') something 'in relation to' ('ad-') what you already know — that's what apperception means.