Webster's English Dictionary

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oratory

1. or.a.to.ry \'o.r-*-.to-r-e-, 'a:r-, -.to.r-\ n [ME oratorie, fr. LL 
   oratorium, fr. L oratus, pp.] 1: a place of prayer; esp : a private or 
   institutional chapel  2: an Oratorian congregation, house, or church 
2. oratory n [L oratoria, fr. fem. of oratorius oratorical, fr. oratus, 
   pp]. 1: the art of an orator  2: ORATION