The Collaborative International Dictionary of English v.0.48:

Tragedy \Trag"e*dy\, n.; pl. Tragedies. [OE. tragedie, OF.
   tragedie, F. trag['e]die, L. tragoedia, Gr. ?, fr. ? a tragic
   poet and singer, originally, a goat singer; ? a goat (perhaps
   akin to ? to gnaw, nibble, eat, and E. trout) + ? to sing;
   from the oldest tragedies being exhibited when a goat was
   sacrificed, or because a goat was the prize, or because the
   actors were clothed in goatskins. See Ode.]
   [1913 Webster]
   1. A dramatic poem, composed in elevated style, representing
      a signal action performed by some person or persons, and
      having a fatal issue; that species of drama which
      represents the sad or terrible phases of character and
      life.
      [1913 Webster]

            Tragedy is to say a certain storie,
            As olde bookes maken us memorie,
            Of him that stood in great prosperitee
            And is yfallen out of high degree
            Into misery and endeth wretchedly.    --Chaucer.
      [1913 Webster]

            All our tragedies are of kings and princes. --Jer.
                                                  Taylor.
      [1913 Webster]

            tragedy is poetry in its deepest earnest; comedy is
            poetry in unlimited jest.             --Coleridge.
      [1913 Webster]

   2. A fatal and mournful event; any event in which human lives
      are lost by human violence, more especially by
      unauthorized violence.
      [1913 Webster] Tragic