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.
Wiktionary(5.00 / 1 vote)Rate this definition: 1  illusion(Noun) Anything that seems to be something that it is not. 2  illusion(Noun) A misapprehension; a belief in something that is in fact not true. 3  illusion(Noun) A magicianu2019s trick. 4  illusion(Noun) The fact of being an illusion (in any of the above senses).