per ‧ pe ‧ tu ‧ i ‧ ty /ˌpɜːpəˈtjuːəti, ˌpɜːpɪˈtjuːəti $ ˌpɜːrpəˈtuː-/ BrE AmE noun
in perpetuity law for all future time SYN forever :
The land had been promised to the Indian tribes in perpetuity.
per ‧ pe ‧ tu ‧ i ‧ ty /ˌpɜːpəˈtjuːəti, ˌpɜːpɪˈtjuːəti $ ˌpɜːrpəˈtuː-/ BrE AmE noun
in perpetuity law for all future time SYN forever :
The land had been promised to the Indian tribes in perpetuity.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012