/
ˌɛmpʌɪˈriːən, 
-pɪ-, 
ɛmˈpɪrɪən/
adj.
 literary relating to heaven.
n.
 
(
the empyrean)
 the highest part of heaven, thought by the ancients to be the realm of pure fire. 
▸literary the sky.
Derivative
- empyreal
 /ˌɛmpʌɪˈriːəl, -pɪ-, ɛmˈpɪrɪəl/
 adj.
Etymology
ME: via med. L. from Gk empurios, from en- ‘in’ + pur ‘fire’.