VENTURE definition : 1. a new activity that may not be successful: 2. to leave a safe place and go somewhere that may…. Learn more. Master the word " VENTURE " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. Venture definition : An undertaking that is dangerous, daring, or of uncertain outcome. A venture is a risky undertaking. If your latest venture is a dog food store, you hope there are some hungry dogs around. Also, to venture is to go somewhere possibly dangerous, like if you venture out into a snowstorm.