Platonic Love, love between persons of different sexes, in which as being love of soul for soul no sexual passion intermingles; is so named agreeably to the doctrine of Plato, that a man finds his highest happiness when he falls in with another who is his soul's counterpart or complement.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Platoff, Matvei Ivanovich, Count * Platonic Year