the situation that exists as a result of an important (and usually unpleasant) event, especially a war, an accident, etc. A lot of rebuilding took place in the aftermath of the war. the assassination of the Prime Minister and its immediate aftermath How does a country cope with the aftermath of war? The president visited the region in the immediate aftermath of the disaster. Word Origin late 15th cent. (in the farming sense of new grass growing after mowing): from the adjective after + dialect math ‘mowing’, of Germanic origin; related to German Mahd.