Source : Webster's Revised Unabridged Dictionary (1913)

Parousia \Pa*rou"si*a\, n. [NL., fr. Gr. ?. See {Parusia}.]
   (a) The nativity of our Lord.
   (b) The last day. --Shipley.

Source : WordNet®

Parousia
     n : (Christian theology) the reappearance of Jesus as judge for
         the Last Judgment [syn: {Second Coming}, {Second Coming
         of Christ}, {Second Advent}, {Advent}]