This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The process whereby ideas of another are unconsciously incorporated into one's own psyche.

n. The act of throwing within.

n. (psychoanalysis) the internalization of the parent figures and their values; leads to the formation of the superego

n. (psychology) unconscious internalization of aspects of the world (especially aspects of persons) within the self in such a way that the internalized representation takes over the psychological functions of the external objects

"When external authority figures such as parents, teachers or family members communicate verbal and nonverbal instructions about physical and emotional survival, we coalesce those voices into one voice—The Voice—by a process called introjection internalizing authority figures."

internalisation    incorporation    internalization