Meaning

noun the consequences of an event (especially a catastrophic event)

noun the outcome of an event especially as relative to an individual

originEtymology tree Proto-Indo-European *h₂ep Proto-Indo-European *-o Proto-Indo-European *h₂epó Proto-Indo-European *-teros Proto-Indo-European *h₂ep(o)teros Proto-Germanic *after Old English æfter Middle English after English after ▲ Old English æfter Old English æfter- Middle English after- English after- English math English aftermath From after- + math (“a mowing”).

Etymology from Wiktionary, CC BY-SA 3.0