Grand  —adj. 1 splendid, magnificent, imposing, dignified. 2 main; of chief importance. 3 (grand) of the highest rank (grand duke). 4 colloq. Excellent, enjoyable. 5 belonging to high society. 6 (in comb.) (in names of family relationships) denoting the second degree of ascent or descent (granddaughter). —n. 1 = *grand piano. 2 (pl. Same) (usu. In pl.) Esp. Us slang a thousand dollars or pounds.  grandly adv. Grandness n. [latin grandis full-grown]