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noun Electricity.
  1. a transformer having a single coil that serves as both a primary coil and a secondary coil.
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Origin of autotransformer

First recorded in 1890–95; auto-1 + transformer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for autotransformer


  1. a transformer in which part of the winding is common to both primary and secondary circuits
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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