oracle
noun /ˈɒrəkl/
  /ˈɔːrəkl/
 [countable]- (in ancient Greece) a place where people could go to ask the gods for advice or information about the future; the priest or priestess through whom the gods were thought to give their message- They consulted the oracle at Delphi.
 
- (in ancient Greece) the advice or information that the gods gave, which often had a hidden meaningTopics Suggestions and advicec2                                     
- [usually singular] (often humorous) a person or book that gives valuable advice or information- My sister's the oracle on investment matters.
 
Word Originlate Middle English: via Old French from Latin oraculum, from orare ‘speak’.