Webster's English Dictionary

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oratorian

Or.a.to.ri.an \.o.r-*-'to-r-e--*n, .a:r-, -'to.r-\ n : a member of the 
   Congregation of the Oratory of St. Philip Neri originati ng in Rome in 1564 
   and comprising independent communities of secular priests under obedience 
   but without vows - Oratorian aj