A state of being which extends infinitely, but which never actually occurs. Used to describe such phenomena as:
* the time at which students promise to submit makeup work
* the time at which your advisor promises to respond to your work
* the time at which that journal will tell you whether your piece has been accepted
* the time at which you promise both the above-referenced journal and your advisor you will submit work
One similar concept is that of "jam every other day," from Lewis Carroll's Through the Looking Glass. Because jam was available "every other day," the White Queen promised Alice that while jam had been available yesterday, and would be available tomorrow, there was never jam today.