The Collaborative International Dictionary of English v.0.48:

Aftermath \Aft"er*math\, n. [After + math. See Math.]
   A second moving; the grass which grows after the first crop
   of hay in the same season; rowen. --Holland.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aftermath
    n 1: the consequences of an event (especially a catastrophic
         event); "the aftermath of war"; "in the wake of the
         accident no one knew how many had been injured" [syn:
         aftermath, wake, backwash]
    2: the outcome of an event especially as relative to an
       individual [syn: consequence, aftermath]