1. come up with an idea or method without planning
the result of improvisation
To improvise means to perform (act, speak, play music) without prior planning or rehearsal. "The film was made entirely with scenes improvised by the actors." "If you want to play jazz you will spend a lot of time improvising with other musicians." It can also mean to 'make do' or produce something from what materials or resources are available. "He improvised a puppet from a newspaper." "They improvised a meal with what they found in the kitchen." You will often hear the word 'improvise' when it comes to situations demanding creativity.