'Dress rehearsal' definitions:

Definition of 'dress rehearsal'

(from WordNet)
noun
A full uninterrupted rehearsal in costumes shortly before the first performance

Definition of 'Dress rehearsal'

From: GCIDE
  • Rehearsal \Re*hears"al\ (r?*h?rs"a), n. The act of rehearsing; recital; narration; repetition; specifically, a private recital, performance, or season of practice, in preparation for a public exhibition or exercise. --Chaucer. [1913 Webster]
  • In rehearsal of our Lord's Prayer. --Hooker. [1913 Webster]
  • Here's marvelous convenient place for our rehearsal. --Shak. [1913 Webster]
  • Dress rehearsal (Theater), a private preparatory performance of a drama, opera, etc., in costume. [1913 Webster]