| 1. | the state or character of being perpetual (often prec. by in): to desire happiness in perpetuity. |
| 2. | endless or indefinitely long duration or existence; eternity. |
| 3. | something that is perpetual. |
| 4. | an annuity paid for life. |
| 5. | Law. an interest under which property is less than completely alienable for longer than the law allows. |
perpetuity
in perpetuity
For all time, forever, as in This land was given to the state in perpetuity. [First half of 1400s]