Definition of empyrean:
(n) :
the region of pure light and fire; the highest heaven, where the pure element of fire was supposed by the ancients to exist: the same as the
ether, the ninth heaven according to ancient astronomy
(adj) :
empyreal; of the
sky or the
heavens; celestially refined
"1667: John Dryden, Annus Mirabilis - In th'empyrean heaven, the bless'd abode, / The Thrones and the Dominions prostrate lie, / Not daring to behold their angry God."