Crossword Genius

1/640 of a square mile (4)

Ross

I believe the answer is:

acre

(Other definitions for acre that I've seen before include "Square measure of land" , "Imperial land measure" , "stretch of land" , "once occupied by Crusaders" , "point four nought five of a hectare" .)

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