1. A conversation or exchange of words between two or more people that is created spontaneously without prior planning or preparation
The actors performed an improvised dialogue on stage that delighted the audience.
Os atores realizaram um diálogo improvisado no palco que encantou o público.
2. In theater or performance, a spontaneous exchange of lines between characters that is not scripted
The comedy sketch relied heavily on improvised dialogue between the two performers.
O sketch de comédia dependia muito do diálogo improvisado entre os dois atores.