The Collaborative International Dictionary of English v.0.48:

Empyrean \Em`py*re"an\ (?; 277), n. [See Empyreal.]
   The highest heaven, where the pure element of fire was
   supposed by the ancients to subsist.
   [1913 Webster]

         The empyrean rung
         With hallelujahs.                        --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Empyrean \Em`py*re"an\, a.
   Empyreal. --Akenside.
   [1913 Webster]

WordNet (r) 3.0 (2006):

empyrean
    adj 1: of or relating to the sky or heavens; "the empyrean
           sphere" [syn: empyrean, empyreal]
    2: inspiring awe; "well-meaning ineptitude that rises to
       empyreal absurdity"- M.S.Dworkin; "empyrean aplomb"- Hamilton
       Basso; "the sublime beauty of the night" [syn: empyreal,
       empyrean, sublime]
    n 1: the apparent surface of the imaginary sphere on which
         celestial bodies appear to be projected [syn: celestial
         sphere, sphere, empyrean, firmament, heavens,
         vault of heaven, welkin]