Etymology
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substation (n.)

also sub-station, 1864 in the policing sense, from sub- + station (n.). Power grid sense is attested from 1889.

updated on May 07, 2014

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Definitions of substation from WordNet

substation (n.)
a subsidiary station where electricity is transformed for distribution by a low-voltage network;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.