Webster's Revised Unabridged Dictionary · 1913

Oratory

Oratory , noun

[Old English oratorie, from Latin oratorium, from oratorius of praying, of an orator: compare French oratoire. See Orator, Oral, and compare Oratorio.]

A place of orisons, or prayer; especially, a chapel or small room set apart for private devotions.
An oratory [temple]... in worship of Dian. — Chaucer
Do not omit thy prayers for want of a good oratory, or place to pray in. — Jer. Taylor
Collocations (1)
Fathers of the Oratory (Roman Catholic Church) , a society of priests founded by St. Philip Neri, living in community, and not bound by a special vow. The members are called also oratorians.

Oratory , noun

[Latin oratoria (sc. ars) the oratorical art.]

The art of an orator; the art of public speaking in an eloquent or effective manner; the exercise of rhetorical skill in oral discourse; eloquence.
The oratory of Greece and Rome. — Milton
When a world of men Could not prevail with all their oratory. — Shakespeare