I've been looking for the word denoting something taking place for the latest time in an indefinitely large series, for example, the solar eclipse occurring for the______ th(?) time from the beginning of the World.
Being aware of the words "umpteenth" and "umptieth", both meaning coming after all others in an indefinitely numerous series, I'm not sure they perfectly match the idea of repetition of the event for only god knows what time. Asking this, I bear in mind that suffixes "-teenth" and "-ties" in ordinal numerals are used to form those either from 13 to 19 or tens from 20 to 90. So is there a single word/common expression to comply with my request?