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.
  of, by, or according to the clock (used in specifying the hour of the day): According to an imaginary clock dial with the observer at the center and 12 o'clock considere â¦ d as straight ahead in horizontal position or straight up in vertical position.'clock is a contraction. It is the shortened form meaning of the clock. (Just so you know, the mark after the o is an apostrophe, not a comma. A comma and an apostrophe loo â¦ k alike.