Definition of monopsychism in US English:

monopsychism

noun

Metaphysics
  • The theory, found in Neoplatonic thought and in the Averroistic school of medieval Aristotelianism, that there is but one immortal soul or intellect in which all humans somehow share.

Origin

Mid 19th century. From mono- + psychism. Compare earlier polypsychism.

Pronunciation

monopsychism

/ˌmɒnə(ʊ)ˈsʌɪkɪz(ə)m/