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countable and uncountable, plural rehearsals
The practicing of something which is to be performed before an audience, usually to test or improve the interaction between several participating people, or to allow technical adjustments with respect to staging to be done. quotations examples
After modifications had been effected by the builders, a rehearsal of electric operation was held on September 17. A complete day's timetable was run through and apparently all went well, except for insulator trouble with the overhead wires near Anniesland; a further rehearsal was held on the following Sunday.
1961 November, “Talking of Trains: "Blue trains" run again”, in Trains Illustrated, page 644
A preparatory activity analogous to the rehearsal of a show. examples
The act of rehearsing or contriving something; the fact of something's being rehearsed. examples