substation


sub·sta·tion

noun \ˈsəb-ˌstā-shən\

: a place where the strength of electricity is changed as the electricity passes through on its way from the power plant to homes and businesses

: a police station that serves a particular area

Full Definition of SUBSTATION

:  a subordinate or subsidiary station: as
a :  a branch post office
b :  a subsidiary station in which electric current is transformed
c :  a police station serving a particular area

First Known Use of SUBSTATION

1881

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