arˈcadianism [f. Arcadian a.1 + -ism.] Ideally simple rusticity, pastoral simplicity. 1824D'Israeli Cur. Lit. (1866) 412/1 That Shenstone not only ‘affected that arcadianism.’1859Masson Brit. Novelists iv. 216 A spirit of lyrical pathos, and of poetical Arcadianism.