(plural rules against perpetuities)
- (law, singular only) 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.
- (law, 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.
rule against perpetuities - Legal Definition
The common law principle that prohibits granting of an estate that will not vest within 21 years of that granting, that is, within 21 years of the death of the person who created the interest. Its purpose is to limit the amount of time that title to a property could be suspended and thereby keep the property from becoming available in the market.