online
Americanadjective
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operating under the direct control of, or connected to, a main computer.
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connected by computer to one or more other computers or networks, as through a commercial electronic information service or the internet.
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of or denoting a business that transmits electronic information over telecommunications lines.
an online bookstore.
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available or operating on a computer or computer network.
an online dictionary.
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by means of or using a computer.
online shopping.
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Radio. (of a network) supplying affiliated stations with all or a substantial part of their programming.
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Television. of or relating to the final editing of a videotaped program.
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done or accomplished while in operation or active service.
online maintenance.
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located on major routes or rail lines.
online industries.
adverb
adjective
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of, relating to, or concerned with a peripheral device that is directly connected to and controlled by the central processing unit of a computer
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of or relating to the internet
online shopping
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occurring as part of, or involving, a continuous sequence of operations, such as a production line
adverb
Etymology
Origin of online
First recorded in 1915–20 (in sense “located on rail lines”); 1945–50 for other senses
Explanation
When you're online, you are using a computer or other device that's connected to the Internet. If someone asks if you're online, they're wondering whether you have Internet access. You might say, "I need to go online and check my email," or "I don't know if she's still meeting me — she hasn't been online all day." Or you could describe something that's available or readable on the Internet, like a news story, as being online. While the adjective officially describes a connection to any computer network, it's almost always used these days to mean "on the Internet." The word online has been around since 1950.
Vocabulary lists containing online
TEKS ELAR Academic Vocabulary List (5th-7th grades)
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Journalism
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Media Literacy - Introductory
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Sedarat is the son of Roger Sedarat, an Iranian-American poet and professor at Queens College in New York City, according to public records and information shared online by the family.
From The Wall Street Journal ● Jul. 29, 2026
Wolfoo, a Vietnamese animation about a young wolf who lives with his family, has had hundreds of millions of views online.
From BBC ● Jul. 29, 2026
Miami homes appeared to be the most attractive to international buyers, as measured by international online views in the first quarter of the year, according to Realtor.com.
From MarketWatch ● Jul. 29, 2026
Some people online said the image was so striking that they thought it was AI-generated.
From Barron's ● Jul. 29, 2026
When you are all online, I, as the quizmaster, will show you a series of ten questions, each one with four possible answers.
From "Mr. Lemoncello's Library Olympics" by Chris Grabenstein
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
