Eternity
Part of speech: noun
Definition: Existence without end, infinite time. A period of time which extends infinitely far into the future. (metaphysical) The remainder of time that elapses after death. A comparatively long time.
Example sentence: A photograph can be an instant of life captured for eternity that will never cease looking back at you.
Timelessness
Part of speech: noun
Definition: The property of being timeless.
Example sentence: I concern myself with timelessness all the time. If you're not swinging for museum quality, your mind is not in the right place. It doesn't mean you get there, but at least it's the intent.