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substation

[suhb-stey-shuh n]
noun
  1. a branch of a main post office.
  2. an auxiliary power station where electrical current is converted, as from AC to DC, voltage is stepped up or down, etc.
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Origin of substation

First recorded in 1885–90; sub- + station
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for substation

substation

noun
  1. a subsidiary station
  2. 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
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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

Word Origin and History for substation

n.

1881, in the policing sense, from sub- + station (n.). Power grid sense is attested from 1901.

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Online Etymology Dictionary, © 2010 Douglas Harper