[ suhb-stey-shuh n ]
/ ˈsʌbˌsteɪ ʃən /


a branch of a main post office.
an auxiliary power station where electrical current is converted, as from AC to DC, voltage is stepped up or down, etc.

Origin of substation

First recorded in 1885–90; sub- + station Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for substation

British Dictionary definitions for substation

/ (ˈsʌbˌsteɪʃən) /


a subsidiary station
an installation at which electricity is received from one or more power stations for conversion from alternating to direct current, reducing the voltage, or switching before distribution by a low-tension network
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012