Source : Webster's Revised Unabridged Dictionary (1913)

Eternity \E*ter"ni*ty\, n.; pl. {Eternities}. [F.
   ['e]ternit['e], L. aeternitas, fr. aeternus. See {Etern}.]
   1. Infinite duration, without beginning in the past or end in
      the future; also, duration without end in the future;
      endless time.

            The high and lofty One, that inhabiteth eternity.
                                                  --Is. lvii.
                                                  15.

   2. Condition which begins at death; immortality.

            Thou know'st 't is common; all that lives must die,
            Passing through nature to eternity.   --Shak.

Source : WordNet®

eternity
     n 1: time without end [syn: {infinity}]
     2: a state of eternal existence believed in some religions to
        characterize the afterlife [syn: {timelessness}, {timeless
        existence}]
     3: a seemingly endless time interval (waiting)