WordReference Random House Learner's Dictionary of American English © 2015
af•ter•math /ˈæftɚˌmæθ/USA pronunciation   n. [countable;
usually singular]
  1. something that follows from an event:in the aftermath of the war.

WordReference Random House Unabridged Dictionary of American English © 2015
af•ter•math  (aftər math′, äf-), 
  1. something that results or follows from an event, esp. one of a disastrous or unfortunate nature;
    consequence:the aftermath of war; the aftermath of the flood.
  2. a new growth of grass following one or more mowings, which may be grazed, mowed, or plowed under.
after + math a mowing, Old English mǣth;
cognate with Old High German mād (German Mahd);
akin to mow1
1 . outcome, result, upshot.

Collins Concise English Dictionary © HarperCollins Publishers::

aftermath /ˈɑːftəˌmɑːθ -ˌmæθ/ n
  1. signs or results of an event or occurrence considered collectively, esp of a catastrophe or disaster: the aftermath of war
  2. a second mowing or crop of grass from land that has already yielded one crop earlier in the same year
Etymology: 16th Century: after + math a mowing, from Old English mæth

'aftermath' also found in these entries:

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