noun, plural autos.
of or relating to automobiles: an auto salesman; auto detailing.

1895–1900, Americanism; by shortening Unabridged


a combining form meaning “self,” “same,” “spontaneous,” used in the formation of compound words: autograph, autodidact.
Also, especially before a vowel, aut-.

< Greek, combining form of autós self


a combining form representing automobile in compound words: autocade.

see auto


a combining form representing automatic in compound words: autoalarm; autofeed; autofocus . Sometimes also taken as an adjective: auto enlarger; auto stop control; auto dialer. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source Link To auto
World English Dictionary
auto (ˈɔːtəʊ)
n , pl -tos
1.  a.  short for automobile
 b.  (as modifier): auto parts
2.  informal (Indian) short for autorickshaw

auto- or (sometimes before a vowel) aut-
combining form
1.  self; same; of or by the same one: autobiography
2.  acting from or occurring within; self-caused: autohypnosis
3.  self-propelling; automatic: automobile
[from Greek autos self]
aut- or (sometimes before a vowel) aut-
combining form
[from Greek autos self]

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

from Gk. auto- "self, one's own," combining form of autos "self, same," of unknown origin. Before a vowel, aut-; before an aspirate, auth-. In Gk. also used as a prefix to proper names, e.g. automelinna "Melinna herself." The opposite prefix would be allo-.

shortened form of automobile, 1899, from Fr. auto.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

auto- or aut-
Self; same: autogamy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
A prefix meaning "oneself," as in autoimmune, producing antibodies or immunity against oneself. It also means "by itself, automatic," as in autonomic, governing by itself.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Abbreviations & Acronyms
  1. automatic

  2. automotive

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
Ultimate auto album: an illustrated history of the automobile.
Many of those grasping for a sign of economic optimism these days have pointed
  to the auto industry.
There is good reason to keep the auto industry alive through this downturn, he
There are no reliable per capita data on regional differences in personal auto
  or air travel.
Copyright © 2015, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature