PLATONICAL
Pla*ton"ic, Pla*ton"ic*al, a. Etym: [L. Platonicus, Gr. platonique.]
1. Of or pertaining to Plato, or his philosophy, school, or opinions.
2. Pure, passionless; nonsexual; philosophical. Platonic bodies, the
five regular geometrical solids; namely, the tetrahedron, hexahedron
or cube, octahedron, dodecahedron, and icosahedron.
– Platonic love, a pure, spiritual affection, subsisting between
persons of opposite sex, unmixed with carnal desires, and regarding
the mind only and its excellences; -- a species of love for which
Plato was a warm advocate.
– Platonic year (Astron.), a period of time determined by the
revolution of the equinoxes, or the space of time in which the stars
and constellations return to their former places in respect to the
equinoxes; -- called also great year. This revolution, which is
caused by the precession of the equinoxes, is accomplished in about
26,000 years. Barlow.
Source: Webster’s Unabridged Dictionary 1913 Edition