Stable  —adj. (-bler, -blest) 1 firmly fixed or established; not likely to move or change. 2 (of a person) not easily upset or disturbed. —n. 1 building for keeping horses. 2 establishment for training racehorses. 3 racehorses from one stable. 4 persons, products, etc., having a common origin or affiliation. 5 such an origin or affiliation. —v. (-ling) put or keep in a stable.  stably adv. [latin stabilis from sto to stand]