oratory

Short definition from Wiktionary

Noun

1. 1
   A private chapel or prayer room.
2. 2
   A Roman Catholic chapel; a building for public or private worship that is not a parish church.
3. 3
   A Catholic church belonging to the Oratory of Saint Philip Neri.
4. 4
   The art of public speaking, especially in a formal, expressive, or forceful manner.
5. 5
   Eloquence; the quality of artistry and persuasiveness in speech or writing.
6. 6
   Alternative letter-case form of oratory: a church belonging to the Oratory.

Proper noun

1. 1
   The Oratory of Saint Philip Neri, a society of priests and lay brothers founded in 1575.