1. The concluding part of a performance, speech, or presentation that is delivered without prior preparation or script, improvised on the spot
The comedian's ad-lib finale had the audience laughing until the very end.
O final improvisado do comediante fez a plateia rir até o final.
2. An unscripted ending to a theatrical or musical performance that is created spontaneously by the performer(s)
The musical's ad-lib finale became the most memorable part of the show.
O final improvisado do musical tornou-se a parte mais memorável do espetáculo.