ˈvetoismrare. [f. veto n. + -ism.] Exercise or advocacy of the power of veto. 1815D. O'Connell Let. 13 June (1972) II. 47 A priest suspected of Vetoism loses all his respect.1897Westm.Gaz. 17 Dec. (Cassell's Suppl.), Vetoism has nothing to say against the immense amount spent in that way.