rare. [f. ADVENTURE sb. + -ISM, with special reference to adventur-er, -ess.] The principles and practice of an adventurer or adventuress; defiance of the ordinary canons of social decorum.
1812. Aurora General Advertiser (Philadel.), 14 Feb., 2/4. They have sobered us from a delirium of adventurism.
1843. For. & Col. Q. Rev., II. 343. Concubinage, Socialism, and Adventurism, and all the practical results.
