Duration
Duration is the term used by Helena Petrovna Blavatsky for what we could call "atemporality". This is one of the aspects of the Absolute.[1]
Mme. Blavatsky was asked about the difference between duration and time:
Q. What is the difference between Time and Duration?
A. Duration is; it has neither beginning nor end. How can you call that which has neither beginning nor end, Time? Duration is beginningless and endless; Time is finite.
Q. Is, then, Duration the infinite, and Time the finite conception?
A. Time can be divided; Duration—in our philosophy, at least—cannot. Time is divisible in Duration—or, as you put it, the one is something within Time and Space, whereas the other is outside of both.[2]
It is important to notice that duration is not an infinite extension of time (called sempiternity), but it is altogether beyond time.