early 15c., "to risk the loss" (of something), shortened form of aventure, itself a form of adventure. General sense of "to dare, to presume" is recorded from 1550s. Related: Ventured; venturing.
Nought venter nought have [Heywood, "Proverbs," 1546]
c. 1400, "fortune, chance," shortening of aventure (n.), a variant of adventure (n.); also from Anglo-French venture. Sense of "risky undertaking" first recorded 1560s; meaning "enterprise of a business nature" is recorded from 1580s. Venture capital is attested from 1943.