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English definition of “online”

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adjective, adverb [not gradable]  /ˈɔnˈlɑɪn, ˈɑn-/ ( also on-line) us  
using a computer to communicate with other computers, or of or about a computer that is connected to another computer: I went online to see if I got any e-mail. The computer isn’t on-line now, so the phone line is available.
(Definition of online from the Cambridge Academic Content Dictionary © Cambridge University Press)
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