adv. [f. prec. + -LY.] In a contagious manner: a. By contagion. † b. Pestilentially, in a way to breed disease.
1615. G. Sandys, Trav., II. 208. A towne … most contagiously seated by reason of the marishes.
1832–4. De Quincey, Cæsars, Wks. X. 85. Other armies had revolted, and the rebellion was spreading contagiously.
1867. Mill, Inaug. Addr., 37. There is nothing which spreads more contagiously from teacher to pupil than elevation of sentiment.
