Rosh Hashona rosh·has·hona uncommon noun 1. (Judaism) a solemn Jewish feast day celebrated on the 1st or 1st and 2nd of Tishri; noted for the blowing of the shofar SynonymsRosh HashanahRosh HashanaRosh HashonahRosh HashonaJewish New Year Related words Word family Rosh Hashonah Broader terms High Holy Dayfeast day WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.