Platonic (adjective)

1. Relating to the philosophy of Plato or to Platonic ideas.
2. Purely spiritual and without sensual desire.
3. Describing a relationship in which the individuals are friends and nothing more.

Origin:

Early 17th century: from platonic, from the name of plato, who held that the ideal forms of things are more real than their physical manifestations.

Examples:

1. Platonic love is a deep affectionate friendship.
2. He had a platonic relationship with her.
3. It was a platonic friendship that never turned into romance.
4. He was interested in the platonic ideal of beauty.
5. The relationship between the teacher and student is platonic.