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Definition of Rule against perpetuities
1. Noun. (legal singulare tantum) The rule that prevents a testator or other transferor of property from controlling further transfer of his property more than twenty-one years after the death of anyone alive at the time of the original transfer who may have some interest in the transfer. ¹
2. Noun. (legal countable by extension) Any rule that prevents a testator or other transferor of property from controlling further transfer of his property beyond a certain length of time. ¹
¹ Source: wiktionary.com