ADVENTURE definition: 1. an unusual, exciting, and possibly dangerous activity, such as a trip or experience, or the…. Learn more., Using expert advice and traveler votes, U.S. News created a list of some of the best adventure vacations in the U.S. for a thrilling walk on the wild side., Definition of adventure noun from the Oxford Advanced Learner's Dictionary. [countable] an unusual, exciting or dangerous experience, journey or series of events. Four members of our staff have embarked on the adventure of a lifetime. They fly around in their rocket ship and go on exciting adventures. When you're a child, life is one big adventure., Adventure is excitement and willingness to do new, unusual, or rather dangerous things., Whether it’s hot air ballooning over Turkey or swimming with dolphins in the Atlantic, these adventure travel experiences are guaranteed to thrill., 1. an exciting or very unusual experience. 2. participation in exciting undertakings or enterprises: the spirit of adventure. 3. a bold, uncertain, and usu. risky undertaking. 4. a commercial or financial speculation; venture. 5. to risk or hazard. 6. to take the chance of; dare. 7. to take the risk involved. 8. to speculate; venture..