What exactly is Big Data? This video defines and explains Big Data as well as Hadoop and MapReduce in simple language.
Rating Newest Oldest. Best Answer: Time is an illusion in that it's not a real, *natural* feature of the universe. Time is not absolute, meaning there's no Cosmic Master Clock that ticks off the correct time for the entire universe.
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Illusion(noun) an unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination. 2  Illusion(noun) hence: Anything agreeably fascinating and charning; enchantment; witchery; glamour.