dēlīrātĭo, ōnis, f. [deliro], originally, a going out of the furrow, in ploughing; hence, trop.,
giddiness, silliness, folly, dotage, madness (very rare): quod vocant lirare, operiente semina, unde primum appellata deliratio est, Plin. 18, 20, 49, § 180: ista senilis stultitia, quae deliratio appellari solet, Cic.de Sen. 11, 36: o delirationem incredibilem! non enim omnis error stultitia est dicenda, id.Div. 2, 43: aliena, Plin.Ep. 6, 15, 4.