An audition is a tryout for a role in a movie, orchestra, or play. If you bomb the audition, you probably won't make it into the cast.
When describing a tryout in which an actor, singer, musician, or dancer tries to prove that he or she is talented enough to earn a part in a show, audition is used as a noun. The word can also be used as a verb, as in, "I auditioned for the part of Peter Pan, but every time I tried to fly I fell flat on my face." Audition shares a common heritage with audience, the group of people who will eventually watch the show for which a performer has auditioned. Both words come from the Middle French term meaning "power of hearing."