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

Encyclopedia: Improv

• ugli
• ugli fruit
• uglify
• uglily
• ugliness
• ugly
• ugly duckling
• Ugo Buoncompagni
• Ugrian
• Ugric
• uh
• uh-huh
• uh-oh
• uh-uh
• UHF
• uhlan
• Uhland
• Uighur
• Uigur
• uintathere
• Uintatheriidae
• Uintatherium
• UK
• ukase
• uke