/ ˈɒrəkl; NAmE ˈɔːr-; ˈɑːr-/ noun [ C ]
1.
(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.
2.
(in ancient Greece) the advice or information that the gods gave, which often had a hidden meaning
3.
[ usually sing. ] a person or book that gives valuable advice or information :
My sister's the oracle on investment matters.
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WORD ORIGIN
late Middle English : via Old French from Latin oraculum , from orare speak.