Crossword Genius

Like September's equinox

Ross

I believe the answer is:

autumnal

(Other definitions for autumnal that I've seen before include "Of the next season" , "Past the prime of growth" , "To do with the harvest season or fall" , "Of the season of mists and mellow fruitfulness" , "Leaves to go at such time" .)

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