Definition of: oracle

(ôr′ə·kəl, or′-) noun
1. The seat of the worship of some ancient divinity, as of Apollo at Delphi, where prophecies were given out by the priests in answer to inquiries.
2. A prophecy thus given.
3. The deity whose prophecies were given.
4. A person of unquestioned wisdom or knowledge, or something regarded as of infallible authority. [<OF <L oraculum <orare speak, pray <os, oris mouth]