oracle

/ˈɔrəkəl/
noun
  1. A person or thing that gives wise or authoritative advice or information.
    • In the movie, the hero seeks out an oracle to learn his destiny.
    • The financial advisor was treated like an oracle by his clients.
    • My grandmother is the oracle of our family; she always knows what to do.
  2. In ancient times, a place where people went to ask the gods for advice or prophecies, or the priest or priestess who delivered the message.
    • The Oracle of Delphi was famous throughout ancient Greece.
    • Kings traveled great distances to consult the oracle.
    • The oracle's prophecy warned of a great war.