Precognition (from the Latin præ-, "before" and cognitio, "acquiring knowledge"), also called future sight, and second sight, is an alleged psychic ability to see events in the future.As with other forms of extrasensory perception, there is no evidence that precognition is a real ability possessed by anyone, however it still appears within movies, books, and discussion within the parapsychology community.Scientific investigation of extrasensory perception is complicated by the definition which implies that the phenomena go against established principles of science.