I use the term “individuation” to denote the process by which a person becomes a psychological “in-dividual“, that is a separate indivisible unity or whole
Individuation is the process of acquiring more consciousness. When Adam and Eve ate the apple, the fruit of knowledge of good and evil, they got more conscious. They started their journey of individuation. This journey aims to increase the level of personal consciousness. The more material hid inside the unconscious we bring to consciousness, the more advanced we are on our journey. The central objective of Jungian Psychology is to steer the person thru the process of individuation.
Many like to compare individuation with the Buddhist concept of illumination, but they are different. Both have the objective of making the person more conscious, one by the absorption of unconscious material, the other by getting closer to God. Some Buddhists may object to my using the word God, but I think this better describes the process. The basic difference is that illumination is a stage one can reach, and individuation is a process. Individuation is a journey and illumination, the final station of the road.