The non-aggression principle (NAP), also called the non-aggression axiom, is a concept in which aggression, defined as initiating or threatening any forceful interference with either an individual or their property, is inherently wrong. It is considered by some to be a defining principle of libertarianism in the United States[better source needed] and is also a prominent idea in anarcho-capitalism and minarchism. In contrast to pacifism, the NAP does not forbid forceful defense.[better source needed] There is no single or universal interpretation or definition of the NAP as it faces several definitional issues, including those revolving around intellectual property, force, abortion, and other topics.
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