auto

auto — noun

1. a passenger car; an everyday short form of 'automobile' used mostly in American

1.nounB1
Definition

a passenger car; an everyday short form of 'automobile' used mostly in American English, especially in compounds about the car industry.

Example

Wairimu parked her auto in front of the diner on Main Street.

countable noun: an auto / his auto

The auto show in Detroit drew thousands of visitors last weekend.

compound: auto show

Common collocations
  • auto show
  • auto industry
  • auto insurance
  • auto parts
  • auto repair
Synonyms
  • car

    the standard everyday word in both British and American English

  • automobile

    more formal and technical; common in industry contexts

  • motor vehicle

    very formal, used in legal or official documents

Usage Note

Common in American English, often in compounds (auto show, auto industry, auto insurance). British speakers usually say 'car' instead.

Common Mistakes

I bought a new auto in London yesterday.
I bought a new car in London yesterday.
British English prefers 'car'; 'auto' sounds odd in everyday UK speech.

auto — adjective

auto — prefix

auto — combining form

Word family

Synonym discussion

Sense: noun/1

All four words name a four-wheeled machine you ride in, but the registers differ. 'Car' is the everyday word in both British and American English and fits any situation. 'Auto' is mainly American and informal; it shows up most in compounds like 'auto show' or 'auto insurance'. 'Automobile' is more formal and technical, common in newspaper headlines and the car industry itself. 'Vehicle' is the broadest, also covering trucks, buses, and motorcycles, and is preferred in legal or police contexts. 'Motor' is older British slang, similar in feel to 'auto' but used less often today. So Wairimu might tell a friend, 'My auto won't start,' but a court report would say, 'The vehicle was parked illegally.'

car ↗automobile ↗vehicle ↗motor ↗

Common collocations

Nouns

  • auto industry
  • auto show
  • auto parts
  • auto insurance
  • auto repair
  • auto mode
  • auto pilot

Phrases

  • on auto
  • in auto mode

Etymology

GreekFrenchEnglish

From Greek 'autos' meaning 'self' or 'same'. English borrowed the form first as a prefix in scientific words like 'autograph' (1791) and 'autobiography' (1809). The noun 'auto' meaning 'car' is a clipping of 'automobile', itself built from the same Greek root plus Latin 'mobilis' (movable); it spread in American speech from around 1899 as cars became common.