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English definition of “online”

online

adverb     /ˌɒnˈlaɪn/
INTERNET, IT bought , done, or used on the internet : All our products are readily available online.do/trade/work online The chain of 315 stores also trades online.buy sth/order sth/shop online Shoppers are getting used to buying online.apply/book online Compare more than 400 credit cards and apply online.
be/go online INTERNET, IT to be or become connected to the internet so that you can use its services : I went online to look for a cheap flight .
come online to be connected to a system and start production of goods , energy , services , etc.: A gas field producing an estimated 20 million cubic meters a day is scheduled to come online by the end of next year .
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(Definition of online adverb from the Cambridge Business English Dictionary © Cambridge University Press)
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