Webster's English Dictionary

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oracle

or.a.cle \'o.r-*-k*l, 'a:r-\ n [ME, fr. MF, fr. L oraculum, fr. orare to 
   speak - more at ORAT]ION 1a: a person (as a priestess of ancient Greece) 
   through whom a deity is bel ieved to speak 1b: a shrine in which a deity so 
   reveals hidden knowledge or the divine pur pose 1c: an answer or decision 
   given by an oracle  2a: a person giving wise or authoritative decisions or 
   opinions  2b: an authoritative or wise expression or answer