ad·ven·ture / adˈvenchər; əd-/ • n. an unusual and exciting, typically hazardous, experience or activity: her recent adventures in Italy. ∎  daring and exciting activity calling for enterprise and enthusiasm: she traveled the world in search of adventure. ∎ archaic a commercial speculation.• v. [intr.] dated engage in hazardous and exciting activity, esp. the exploration of unknown territory. ∎  [tr.] dated put (something, esp. money or one's life) at risk: he adventured $3,000 in the purchase of land.

adventure †chance, hazard, risk XIII; hazardous enterprise XIV. ME. aventure — (O)F. :- Rom. *adventūra, sb. use of fut. part. of L. advenīre; see ADVENT, -URE.
So adventure vb. XIV. adventurer XV. adventurous XIV. Aphetic VENTURE.