Crossword Genius

The "i" in p.s.i (4)

Ross

I believe the answer is:

inch

(Other definitions for inch that I've seen before include "Move slowly, in small steps" , "2.54cm" , "Move in tiny increments" , "Twenty-five point four millimetres" , "See 12" .)

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