LXXX uncommon noun (1) adjective (1) noun 1. the cardinal number that is the product of ten and eight Synonymseighty80fourscore adjective 1. being ten more than seventy Synonymseighty80fourscore Similarcardinal Related words Word family lxxxilxxxiilxxxiiilxxxivlxxxvlxxxvilxxxviilxxxviii Broader terms large integer WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.