oracle
Concise Oxford English Dictionary © 2008 Oxford University Press:
oracle/ˈɒrəkl/
▶noun
- 1 a priest or priestess acting as a medium for divine advice or prophecy in classical antiquity.
■ an infallible authority.
- 2 a response or message given by an oracle, especially an ambiguous one.
– origin ME: via OFr. from L. oraculum, from orare ‘speak’.
'oracle' also found in these Oxford entries:

