1. To create, perform, or speak without preparation or planning, with complete creative liberty and no constraints
The jazz musicians decided to improvise freely during the final set.
Os músicos de jazz decidiram improvisar livremente durante o último set.
2. To compose or perform extemporaneously without following a predetermined structure or script
The actor was encouraged to improvise freely within the scene.
O ator foi encorajado a improvisar livremente dentro da cena.