[ aw-toh ]
/ ˈɔ toʊ /
noun, plural au·tos.
of or relating to automobiles: an auto salesman; auto detailing.
THIS PSAT VOCABULARY QUIZ IS PERFECT PRACTICE FOR THE REAL TEST
In our third teacher-created PSAT practice test there are new and unique vocabulary terms you may have never heard of! Can you guess what they mean?
Question 1 of 10
Origin of auto
An Americanism dating back to 1895–1900; by shortening
Definition for auto (2 of 5)
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 (3 of 5)
a combining form representing automobile in compound words: autocade.
Origin of auto-2
see origin at auto
Definition for auto (4 of 5)
a combining form representingautomatic in compound words: autoalarm; autofeed; autofocus. Sometimes also taken as an adjective: auto enlarger; auto stop control; auto dialer.
Definition for auto (5 of 5)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for auto (1 of 2)
/ (ˈɔːtəʊ) /
noun plural -tos US and Canadian informal
British Dictionary definitions for auto (2 of 2)
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
Medical definitions for auto
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific 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.