汉语翻译：
n. 永久, 不朽, 终身职位, 终身任期, 永久使用权
【经】 永续年金, 终身年金词型变化：
名词复数:perpetuities英语解释：
名词 perpetuity:

the property of being perpetual (seemingly ceaseless)同义词：sempiternity

例句：

These lands were granted to our family in perpetuity.这些土地依法永远归我们家族所有。

The site of the memorial is granted in perpetuity to Canada.纪念馆址已选定在加拿大作为永久的纪念。

详细解释：
per.pe.tu.i.ty
n.（名词）
【复数】 per.pe.tu.i.ties
The quality or condition of being perpetual:
永恒，永远，长存：成为永恒的特性或状态：
例句：
.The perpetuity of the Church was an article of faith.(Morris L. West)
.教会的永恒是一种信仰的契约.(莫里斯L.韦斯特)
Time without end; eternity.
无绝期，无尽期
Law
【法律】
The condition of an estate that is limited so as to be inalienable either perpetually or longer than the period determined by law.
永久所有权，永久不得转让权：房地产被限制以致于可永久地或比法律规定时间长的不得转让的状态
An estate so limited.
永久拥有的房地产：这种限定的房地产
An annuity payable indefinitely.
终身年金：无期限地可获得的年金或养老金
<习惯用语>in perpetuity
For an indefinite period of time; forever.
永远：持续一个无限期的时间段；永远

perpetuity