n A private chapel or prayer room.
n A Roman Catholic chapel; a building for public or private worship that is not a parish church.
n (specifically) A Catholic church belonging to the Oratory of Saint Philip Neri.
n The art of public speaking, especially in a formal, expressive, or forceful manner.
n Eloquence; the quality of artistry and persuasiveness in speech or writing.
n (Roman Catholicism) The Oratory of Saint Philip Neri, a society of priests and lay brothers founded in 1575.
n Alternative letter-case form of oratory: a church belonging to the Oratory. [A private chapel or prayer room.]