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The meaning of ONLINE is connected to, served by, or available through a system and especially a computer or telecommunications system (such as the Internet); also : done while connected to such a system. How to use online in a sentence.
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a. : a book of words or of information about a particular field or set of concepts. especially : a book of words and their synonyms. b. : a list of subject headings or descriptors usually with a cross-reference system for use in the organization of a collection of documents for reference and retrieval. 2.