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in·ci·den·tal·ly / ˌinsiˈdent(ə)lē/ • adv. 1. used when a person has something more to say, or is about to add a remark unconnected to the current subject; by the way: incidentally, it was many months before the whole truth was discovered.2. in an incidental manner; as a chance occurrence: the infection was discovered only incidentally at a postmortem examination.