having an ability to know what happens in the future, or know what people are thinking marked by a supernatural foresight that is outside the sphere of science or knowledge;
e.g. Sherlock Holmes is known for using the powers of deduction as a form of psychic ability.
(noun)
a person that claims to be sensitive to nonphysical forces;
e.g. They saw a stall for a psychic and decided to get their fortunes told.