aftermathPronunciation: /ˈɑːftəmaθ/Translate aftermath | into French | into German | into Italian | into Spanish Definition of aftermath noun 1the consequences or after-effects of a significant unpleasant event:food prices soared in the aftermath of the drought 2 Farming new grass growing after mowing or harvest. Origin: late 15th century (in sense 2): from after (as an adjective) + dialect math 'mowing', of Germanic origin; related to German Mahdaftermath in other Oxford dictionaries Definition of aftermath in the US English dictionary