Forever; of unlimited duration. There is a strong bias in the law against things that are to last in perpetuity. Rights that are to last forever are said to hinder commerce as an impediment to the circulation of property. That is why there is a rule against perpetuities.
PERPETUITY
Meaning of PERPETUITY in English
Duhaime's Law English dictionary. Английский юридический словарь Duhaime . 2012