substation

[suhb-stey-shuhn]

Origin

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noun

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.

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Origin:
1885–90; sub- + station

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Substation is always a great word to know.

So is ninnyhammer. Does it mean:

a fool or simpleton; ninny.

a stew of meat, vegetables, potatoes, etc.

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Collins

World English Dictionary

substation (ˈsʌbˌsteɪʃən)

—n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

substation

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

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substation

sub·sta·tion