auto-

1

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

Origin of auto-

1
< Greek, combining form of autós self

Definition for auto- (2 of 3)

auto-

2

a combining form representing automobile in compound words: autocade.

Origin of auto-

2
see origin at auto

Definition for auto- (3 of 3)

auto-

3

a combining form representing automatic in compound words: autoalarm; autofeed; autofocus. Sometimes also taken as an adjective: auto enlarger; auto stop control; auto dialer.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for auto-

auto-

sometimes before a vowel aut-

combining form

self; same; of or by the same oneautobiography
acting from or occurring within; self-causedautohypnosis
self-propelling; automaticautomobile

Word Origin for auto-

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

Medicine definitions for auto-

auto-

pref.

Self; same:autogamy.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for auto-

auto-

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.