"Principia" author, 1687

I believe the answer is:

newton

(Other definitions for newton that I've seen before include "Englishman known for his work on gravity and motion" , "SI unit of force" , "Explainer of gravity" , "Gravity theorist" , "Unit of force - English polymath, d. 1727" .)

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

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