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automatic transmission

noun
  1. an automotive transmission requiring either very little or no manual shifting of gears.
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Origin of automatic transmission

First recorded in 1945–50
Also called automatic, automatic drive.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for automatic drive

automatic transmission

noun
  1. a transmission system in a motor vehicle, usually incorporating a fluid clutch, in which the gears change automatically
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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