\Pi"e*tism\ (p[imac]"[-e]*t[i^]z'm), n. [Cf. G. pietismus, F. pi['e]tisme.] 1. The principle or practice of the Pietists. 2. Strict devotion; also, affectation of devotion. The Sch["o]ne Seele, that ideal of gentle pietism, in ``Wilhelm Meister.'' --W. Pater.