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auto-1

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

auto-2

1.
a combining form representing automobile in compound words:
autocade.
Origin
see 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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for auto-

auto-

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
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
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Word Origin and History for 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-.

Online Etymology Dictionary, © 2010 Douglas Harper
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auto- in Medicine

auto- or aut-
pref.
Self; same: autogamy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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auto- in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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4
5
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