- noun the final rehearsal of something such as a play, opera, or ballet in full costume and with lights, music, and effects, before it is given its first public performance
- noun a full-scale practice before any important event
- noun a final rehearsal just before the operation starts
- A rehearsal during which the cast members wear their costumesand make-up as for a performance. Usually the last rehearsal beforethe opening night, it allows the cast to discover any problems withtheir costumes, furniture, or props. Publicity photographs are oftentaken at the dress rehearsal.