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)
a combining form representing automobile in compound words: autocade.
Origin of auto-2
see origin at auto
Definition for auto- (3 of 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-
sometimes before a vowel aut-
self; same; of or by the same oneautobiography
acting from or occurring within; self-causedautohypnosis
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-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for 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.