1950, from on + line. Pronunciation
  • Attributive: enPR: ŏn'līn", IPA: /ˈɒnˌlaɪn/
  • Predicative: enPR: ŏnlīn', IPA: /ɒnˈlaɪn/


  1. Of a system: connected (generally electrically) to a larger network.
    1. Of a generator or power plant: connected to the grid.
    2. Of a computer: actively connected to the Internet or to some other communications service.
      Is this modem online?
  2. Available over, or delivered from, the Internet.
    I prefer to read online newspapers.
  3. Connected to the Internet.
    I'll be online tonight, so I'll be able to reply to your email.
  4. 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.
  5. 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!
Antonyms Translations Translations Translations Translations Adverb

online (not comparable)

  1. While online; while in a running or active state, or connected to the Internet.
    He works online.
Translations Verb

online (onlines, present participle onlining; past and past participle onlined)

  1. (computing, transitive) To bring (a system, etc.) online; to promote to an active or running state.
    • 2013, John Clarke, Oracle Exadata Recipes: A Problem-Solution Approach (page 219)
      The output in Listing 8-2 shows your disk group status prior to onlining the disks, the commands to online your disks, and the status after onlining.

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Offline English dictionary