platonic

Short definition from Wiktionary

Adjective

1. 1
   Neither sexual nor romantic in nature; being or exhibiting platonic love.
2. 2
   Alternative letter-case form of Platonic (of or relating to the philosophical views of Plato and his successors).
3. 3
   Of or relating to the ancient Greek philosopher Plato or his philosophies.
4. 4
   Alternative letter-case form of platonic (non-sexual).

Noun

1. 1
   A Platonist; a follower of Plato's ideas.
2. 2
   A Platonic solid.