Crossword Genius

Hyperbolic ordinal (9)

Ross

I believe the answer is:

umpteenth

(Other definitions for umpteenth that I've seen before include "being so late in ordering" , "Latest of goodness knows how many" , "Nth" , "such an unspecified time?" , "Latest or last of very many" .)

I've seen this clue in The New York Times.
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