perpetuity (noun) 

Perpetuity (pur-pih-TOO-ih-tee) – often preceded by “in” – is the state or character of being perpetual. It is used for something that is of endless or indefinitely long duration or existence. As I used it today: “If… instead of raising money to cover the budget every year, you were able to build an endowment large enough to support yearly expenses from dividend distributions… you wouldn’t have to worry about yearly fundraising. You would know that your program would continue in perpetuity, even after you are gone.”