What is the meaning of Oratory?

A private chapel or prayer room.

A Roman Catholic chapel; a building for public or private worship that is not a parish church.

A Catholic church belonging to the Oratory of Saint Philip Neri.

The art of public speaking, especially in a formal, expressive, or forceful manner.

Eloquence; the quality of artistry and persuasiveness in speech or writing.

Alternative form of oratorie

Source: wiktionary.org