oratory

Concise Oxford English Dictionary © 2008 Oxford University Press:
oratory1 /ˈɒrət(ə)ri/

▶noun (pl. oratories)

• 1 a small chapel for private worship.

• 2 (Oratory) (in the Roman Catholic Church) a religious society of secular priests founded to provide plain preaching and popular services.

– derivatives
Oratorian noun & adjective.

– origin ME: from Anglo-Norman Fr. oratorie, from eccles. L. oratorium, based on L. orare ‘pray, speak’; sense 2 is from Congregation of the Fathers of the Oratory.

Concise Oxford English Dictionary © 2008 Oxford University Press:
oratory2

▶noun

• 1 the art or practice of formal public speaking.

• 2 rhetorical or eloquent language.

– derivatives
oratorical /-ˈtɒrɪk(ə)l/ adjective,
oratorically adverb.

– origin C16: from L. oratoria, fem. of oratorius ‘relating to an orator’.