Dictionary.com
definitions
  • synonyms

auto

[aw-toh]
See more synonyms for auto on Thesaurus.com
noun, plural au·tos.
  1. automobile.
Show More
adjective
  1. of or relating to automobiles: an auto salesman; auto detailing.
Show More

Origin of auto

An Americanism dating back to 1895–1900; by shortening

auto.

auto-1

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

Origin of auto-1

< Greek, combining form of autós self

auto-2

  1. a combining form representing automobile in compound words: autocade.
Show More

Origin of auto-2

see origin at auto

auto-3

  1. a combining form representing automatic in compound words: autoalarm; autofeed; autofocus. Sometimes also taken as an adjective: auto enlarger; auto stop control; auto dialer.
Show More
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for auto

Contemporary Examples

Historical Examples


British Dictionary definitions for auto

auto

noun plural -tos US and Canadian informal
    1. short for automobile
    2. (as modifier)auto parts
  1. Indian informal short for autorickshaw
Show More

auto-

sometimes before a vowel aut-

combining form
  1. self; same; of or by the same oneautobiography
  2. acting from or occurring within; self-causedautohypnosis
  3. self-propelling; automaticautomobile
Show More

Word Origin

from Greek autos self
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

Word Origin and History for auto

n.

shortened form of automobile, 1899; cf. French auto.

Show More

auto-

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

Show More
Online Etymology Dictionary, © 2010 Douglas Harper

auto in Medicine

auto-

pref.
  1. Self; same:autogamy.
Show More
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

auto in Science

auto-

  1. 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.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.