WordWeb Online

1. The characteristic of being exhilarating, tending to upset the mind or senses.
   "How a mere convention gathering could generate such a shift in regard to an issue like abortion reveals something of the headiness in which many of the garthered were luxuriating."
    
2. The characteristic of being intoxicating or stupefying.
   "Wine novices intimidated by the headiness of Napa and Sonoma will feel comfortable at nearly every Oregon winery."
    
3. The quality of being heady

Type of: ambiance, ambience, atmosphere, intensity, intensiveness