a. Obs. rare. [f. L. surreptītius: see next and -IAL.] = next.
1600. W. Watson, Decacordon (1602), 264. The Iesuiticall plots for restoring religion in this land by surreptitial excommunications, depositions, inuasions. Ibid., 327. Surreptitiall suggestions of some euill and factious persons.