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English definition of “incidentally”

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incidentally

adverb uk   /ˌɪn.sɪˈden.təl.i/ us    /-t̬əl-/
C1 used before saying something that is not as important as the main subject of conversation, but is connected to it in some way: We had a marvellous meal at that restaurant you recommended - incidentally, I must give you the number of a similar one I know. used when mentioning a subject that has not been discussed before, often making it seem less important than it really is: Incidentally, I wanted to have a word with you about your travel expenses.
(Definition of incidentally from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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