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English definition of “incidentally”

incidentally

adverb [not gradable]  /ˌɪn·səˈden·təl·i, -ˈdent·li/ us  
used about something that is connected to the main subject but is not as important: “Ain’t” was mentioned only incidentally in an article about nonstandard words. Incidentally is also used to introduce something additional that is not as important: Incidentally, she was a very popular mayor.
(Definition of incidentally from the Cambridge Academic Content Dictionary © Cambridge University Press)
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