Oratorio Definition
 ôrə-tôrē-ō, ŏr- 
  oratorios
  
    noun
  
 
    oratorios
  
A long, dramatic musical composition, usually on a religious theme, consisting of arias, recitatives, choruses, etc. sung to orchestral accompaniment but without stage action, scenery, or costumes.
 Webster's New World 
Synonyms: 
  Other Word Forms of Oratorio
Noun
Singular:
 oratorioPlural:
 oratoriosOrigin of Oratorio
- Italian after Oratorio , the Oratory of Saint Philip Neri at Rome, where famous musical services were held in the 16th century - From American Heritage Dictionary of the English Language, 5th Edition 
-  From Italian oratorio (“oratorical"). From Wiktionary 
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