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From The Collaborative International Dictionary of English v.0.48:
Oratory \Or"a*to*ry\, n.; pl. Oratories. [OE. oratorie, fr. L. oratorium, fr. oratorius of praying, of an orator: cf. F. oratoire. See Orator, Oral, and cf. Oratorio.] A place of orisons, or prayer; especially, a chapel or small room set apart for private devotions. [1913 Webster] An oratory [temple] . . . in worship of Dian. --Chaucer. [1913 Webster] Do not omit thy prayers for want of a good oratory, or place to pray in. --Jer. Taylor. [1913 Webster] Fathers of the Oratory (R. C. Ch.), 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. [1913 Webster]