1. A form of live entertainment characterized by improvisation and interaction with the audience
   - impro 
2. (informal) improvisation
   - impro

Encyclopedia: Improv

• weld
• weldable
• welder
• welder's mask
• welding
• weldment
• welfare
• welfare case
• welfare state
• welfare work
• welfare worker
• welfare-statist
• welfarist
• welkin
• well
• well done
• well I never
• well out
• well over
• well thought out
• well up
• well water
• well-adjusted
• well-advised
• well-appointed