a performance of something that is to be presented to the public, intended to serve as practice, preparation, or a trial, or broadly, an exercise or session during which someone tries something out or practices it;
e.g. They managed to fit in one last rehearsal before the concert.
(noun)
the action or process of doing something as practice or preparation for a later performance to the public.
e.g. I don't want to disturb her rehearsal of her lines for tonight's play.