Source : Free On-Line Dictionary of Computing

International Atomic Time
     
         (TAI) An international standard measurement
        of time based on the comparison of many {atomic clocks}.  TAI
        is maintained by the Bureau International des Poids et Mesures
        (BIPM), the world's governing body for civil atomic time
        measurement.  TAI is the basis for {Coordinated Universal
        Time}.
     
        {BIPM
        (http://www.bipm.fr/enus/5_Scientific/c_time/time_1.html)}.
     
        (2001-08-02)