auto
noun (countable)
UK/ˈɔː.təʊ/US/ˈɑː.toʊ/
An informal term for an automobile; a car.
Example Sentences
I bought a new auto for my daily commute.
Her auto broke down on the highway this morning.
He always checks the oil levels in his auto to prevent engine problems.
The auto parked outside belongs to my neighbor, who loves classic cars.
Some people prefer SUVs over small autos for their family needs, as they offer more space and versatility.
In many European cities, using public transport instead of an auto is more convenient and eco-friendly.
Even though I enjoy the convenience of an auto, I find walking helps me stay active and connected to my surroundings.
While advanced autopilot features can make driving easier, it is crucial for drivers to remain alert and prepared to take control of their autos at any moment.
Thesaurus
Synonyms
How to Use
A prefix or colloquial reference for cars, automation, or self-driven functions.“Auto” can function in different ways depending on context. Most commonly, it’s a short, informal term for “automobile,” as in “I’ll take my auto to the shop.” In conversation or advertising, “auto” may refer to anything related to cars (e.g., “auto parts,” “auto insurance,” “auto industry”). Meanwhile, as a prefix derived from the Greek “autos” (meaning “self”), “auto” appears in words like “automatic,” “autopilot,” or “autobiography,” each implying something self-driven or self-related (e.g., “autopilot” manages flight by itself, “autobiography” is a self-written life story). In tech or user interfaces, “auto” might appear to indicate automatic settings, such as “auto-update” or “auto-correct.” Hence, “auto” highlights self-action, automation, or stands in informally for “car.”
Alternatives
When referring strictly to vehicles, you might replace “auto” with “car,” “vehicle,” or “automobile” for a clearer term. For actions or processes that run on their own, words like “automatic,” “self-operating,” or “autonomous” emphasize independence from manual control. If describing the Greek prefix usage in a more scholarly sense, “self-” can be substituted (e.g., “self-driving” or “self-regulating”) to convey the autonomous or self-governing aspect without the short “auto” form. Ultimately, “auto” works as a versatile shorthand—either pointing to a car or indicating something that acts independently, depending on the context.
Writing
When writing about “auto,” specify what it denotes: if it’s short for “automobile,” mention the context (like the auto market or auto repair). If referencing automated processes, clarify whether it’s an “auto” setting in software, a mechanical function, or a prefix meaning “self.” For instance, “auto-focus” in photography describes a lens adjusting focus automatically without manual intervention. Meanwhile, “auto save” in a text editor ensures your document updates itself without repeated input. By giving a bit of context, you prevent confusion between the sense of “car” and the sense of “automatic,” especially if you’re discussing multiple uses in one piece of writing.
Casual Conversation
In everyday speech, “auto” often appears when folks talk about their cars—“My auto’s in the shop,” or “I need new auto insurance.” It’s also common in store signs or references: “auto parts,” “auto detailing,” or “auto service.” If talking about electronic devices or apps, you might say “Set it to auto,” meaning let the system handle it automatically, e.g., “Just set your phone screen brightness to auto.” People also use “auto” in gaming or computing contexts, referencing features that handle tasks on their own—like “auto-play,” “auto-aim,” or “auto-complete.” In each setting, the word signals a sense of self-operation, automation, or simply a casual stand-in for “car.”
Etymology
“Auto” as a prefix comes from the Greek “autós,” meaning “self,” which forms the basis of many English words: “automatic,” “autonomy,” “autobiography,” etc. As slang for “automobile,” it emerged in the early 20th century when cars began to flood markets, shortening “automobile” to a more convenient term—“auto.” Since then, it’s served as a flexible shorthand in both mechanical and digital realms, spanning everything from “auto mechanics” to “auto settings.” Regardless of usage, that Greek root underscores the notion of self-driven or self-contained action, whether describing self-moving vehicles, do-it-yourself functionality, or processes that handle themselves.
