improv UK /ˈɪmpɹɒv/US /ˈɪmpɹɑv/noun 2verb 1forms 3 noun2 •A form of live entertainment characterized by improvisation and interaction with the audience.She got her start doing improv at The Second City. •(informal) Improvisation. verb1 •To perform improv. formsimprovved · improvving · improvs