Stagione is an organizational system for presenting opera, often used by large houses. Typically each production is cast separately and has a brief but intensive run of performances. By contrast, companies that use a repertory

Repertory

Repertory or rep, also called stock in the United States, is a term used in Western theatre and opera.A repertory theatre can be a theatre in which a resident company presents works from a specified repertoire, usually in alternation or rotation...

system maintain a permanent company and rotate productions over many months or even years. Historically the stagione system has been preferred in Britain, the United States. and most large international operahouses.

Sources

• The Oxford Dictionary of Opera, by John Warrack and Ewan West (1992), 782 pages, ISBN 0-19-869164-5
• The New Grove Dictionary of Opera
  New Grove Dictionary of Opera
  The New Grove Dictionary of Opera is an encyclopedia of opera, considered to be one of the best general reference sources on the subject. It is the largest work on opera in English, and in its printed form, amounts to 5,448 pages in four volumes....
  
  , ed. Stanley Sadie (London, 1992) ISBN 0-333-73432-7