anti-ˈJacobinism [f.prec. + -ism.] The practice and principles of the Anti-Jacobins. 1809Hist. Eur. in Ann.Reg. 93/1 The cry of anti-jacobinism which had been set up with so much vigour.1827Scott in Lockhart Life (1839) IX. 106 The champion of antijacobinism.