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abnormally dangerous activity n: an activity esp. that is not common in or appropriate to an area, that creates a high degree of risk of harm to someone or something despite the exercise of due care, and whose value to the community in the area is outweighed by the risk of harm compare ultrahazardous activity NOTE: Abnormally dangerous activities are subject to strict liability. Abnormally dangerous activity and ultrahazardous activity are sometimes used interchangeably.
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.