What’s a psychic?

From Sirius.com/maryo:
I know most people reading this assume they know just what a Psychic
is, or at least know the dictionary definition of “psychic” is someone
who has “Extra Sensory Perception (ESP),” which is a person who can
foretell future events or someone who can see the past by receiving
visions in their dreams or while awake.
Well, my own [...]