1828 (earlier as a French word in English), from French grandiose "impressive, grand in effect" (18c.), from Italian grandioso (which also was borrowed directly into English as a musical term), from Latin grandis "big" (see grand (adj.)). Related: Grandiosely.
grandeur
grandfather
grandfatherly
grandiloquence
grandiloquent
grandiose
grandiosity
grandly
grandma
grandmaster
grandmother