noun or·a·to·rio \ˌr-ə-ˈtr-ē-ˌō, ˌär-\

: a large piece of music for a group of singers and musicians that is usually about a religious subject

plural or·a·to·ri·os

Full Definition of ORATORIO

:  a lengthy choral work usually of a religious nature consisting chiefly of recitatives, arias, and choruses without action or scenery

Origin of ORATORIO

Italian, from the Oratorio di San Filippo Neri (Oratory of St. Philip Neri) in Rome
First Known Use: 1731


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