You searched for: “monopsychism”
monopsychism (s) (noun), monopsychisms (pl)
The theory, or theories, that all souls (or the souls of all mankind) are one: "There is a unity of souls of all humans according to this concept of monopsychism."
This entry is located in the following units: -ism, -ismus (page 35) mono-, mon- (page 11) psych-, psycho-, -psyche, -psychic, -psychical, -psychically (page 4)