one of the standard times used in North America, based on the local time of the 90° meridian, six hours behind Greenwich Mean Time
2.
one of the standard times used in Australia
Abbreviation: CST
Central Standard Time in American English
US
a standard time used in the zone which includes the central states of the U.S., corresponding to the mean solar time of the 90th meridian west of Greenwich, England: it is six hours behind Greenwich time