from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Mathematics An operation representing a transformation from a given physical system undergoing a given sequence of events to a system in which the exact reverse sequence of events takes place.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an operation that transforms a physical system undergoing a sequence of events into one in which the events take place in the reverse sequence
  • n. T-symmetry


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  • In physics, the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed...i.e., where a mirror (reverse) transformation is applied to a forward direction time state. (Wikipedia)

    May 22, 2008