empyrean em-pie-REE-un; -PEER-ee-, noun:
1. The highest heaven, in ancient belief usually thought to be a realm of pure fire or light.
2. Heaven; paradise.
3. The heavens; the sky.
Of or pertaining to the empyrean of ancient belief.
Empyrean comes from Medieval Latin empyreum, ultimately from Greek empurios, from en-, “in” + pyr, “fire.”