1. an exciting or very unusual experience.
2. participation in exciting undertakings or enterprises: the spirit of adventure.
3. a bold, usually risky undertaking; hazardous action of uncertain outcome.
4. a commercial or financial speculation of any kind; venture.
–verb (used with object)
5. to risk or hazard.
6. to take the chance of; dare.
7. to venture to say or utter: to adventure an opinion.