an authoritative person who divines the future
"After consulting the ancient oracle, the king was certain that his army would conquer the northern province."
a prophecy (usually obscure or allegorical) revealed by a priest or priestess; believed to be infallible
"The ancient oracle offered an obscure prophecy that seemed to foretell the tribe's eventual downfall through symbols of falling stars."
a shrine where an oracular god is consulted
"The ancient travelers gathered at the temple to seek guidance from the oracle before crossing the dangerous mountains."
A shrine dedicated to some prophetic deity.
"Visitors traveled from across the empire to consult the oracle at Delphi for guidance on their future endeavors."
In plain English: An oracle is a person or thing that gives wise predictions or answers to questions.
"The ancient statue was said to be an oracle that told people their future."
Usage: In everyday language, an oracle is not a physical shrine but a person or source regarded as having special knowledge that can predict the future. Use this term when referring to someone whose insights are considered infallible or mysterious rather than describing ancient religious temples.
To utter oracles or prophecies.
"When the priestess raised her staff, she began to mutter strange phrases that sounded like ancient oracles foretelling the kingdom's future."
In plain English: To act as an oracle means to give someone a prediction or answer about something unknown.
"The team oracle'd that the project would finish on time."
Usage: Do not use "oracle" as a verb to mean predicting the future; it is strictly a noun referring to a person who gives wise guidance or prophesies. Instead, use verbs like "prophecy," "predict," or "declare" when describing the act of making a prediction.
A database management system (and its associated software) developed by the Oracle Corporation
"The company decided to migrate their entire customer data warehouse from SQL Server to Oracle after realizing it could handle our growing volume more efficiently."
The word entered English via the Old French form oracle, which was borrowed from the Latin ōrāculum. Originally referring to a divine message or prophecy delivered by a god through a priest, it has retained this core meaning of supernatural revelation in modern usage.