online.
Of a system: connected (generally electrically) to a larger network.
Meaning & usage
Of a system: connected (generally electrically) to a larger network. Of a generator or power plant: connected to the grid.
Of a system: connected (generally electrically) to a larger network. Of a computer: actively connected to the Internet or to some other communications service.
Is this modem online?
Available over, or delivered from, the Internet.
I prefer to read online newspapers.
Connected to the Internet.
I'll be online tonight, so I'll be able to reply to your email.
Available on a computer system, even if not networked.
Press the F1 key to access the online help.
The program comes with an online manual, supplied on compact disc.
Of a system: active, particularly building facilities (such as power) or a factory or power plant.
The power is online.
Once this factory comes online, it will double car production in our country!
Immersed in Internet culture. (Usually modified by an intensifier such as extremely or terminally)
terminally online
Able to process an input piece-by-piece without needing to have the entire input available to it from the start.
Where this word comes from
1950, from on + line.
While online; while in a running or active state, or connected to the Internet.
He works online.
Where this word comes from
1950, from on + line.
To bring (a system, etc.) online; to promote to an active or running state.
Where this word comes from
1950, from on + line.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.