event-based adjective4 •Taken only when sexual activity creates a risk; on demand.event-based PrEP •Synonym of event-driven.event-based programming •Pertaining to exposure (to toxic substances, radiation, etc.) that results from a (usually accidental) event, as opposed to chronic or regularly-occurring exposure.Event-based intake values are converted to final intake values by multiplying the intake per event by the frequency of exposure events, over the timeframe being considered in an exposure assessment. — 2002 •Pertaining to training that involves simulated situations as opposed to drill in specific skills.It should not become what is known as "event-based training." — 2000 formsmore event-based · most event-based