Yom Kippur yom·kip·pur uncommon noun 1. (Judaism) a solemn Jewish fast day; 10th of Tishri; its observance is one of the requirements of the Mosaic Law SynonymsYom KippurDay of Atonement Related words Word family Yom Kippur War Broader terms High Holy Day WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
