Source : Webster's Revised Unabridged Dictionary (1913)

Bliss \Bliss\ (bl[i^]s), n.; pl. {Blisses} (bl[i^]s"[e^]z). [OE.
   blis, blisse, AS. blis, bl[=i][eth]s, fr. bl[=i][eth]e
   blithe. See {Blithe}.]
   Orig., blithesomeness; gladness; now, the highest degree of
   happiness; blessedness; exalted felicity; heavenly joy.

         An then at last our bliss Full and perfect is.
                                                  --Milton.

   Syn: Blessedness; felicity; beatitude; happiness; joy;
        enjoyment. See {Happiness}.