perpetuity

Perpetuity refers to something that lasts forever or for an extremely long time. It's like a promise that won't end.

In everyday life, people often use perpetuity to talk about things they want to last indefinitely. For example, when someone leaves their property to a charity in their will with the condition that it be kept up forever, we might say that the estate is held in perpetuity. This means that the charity has a responsibility to take care of the property and keep its original purpose for as long as possible, even after many generations have come and gone. People also talk about retirement funds or trust accounts being invested with the intention of lasting in perpetuity.