Crossword Genius

Logician's "In that case ... " (4)

Ross

I believe the answer is:

ergo

(Other definitions for ergo that I've seen before include "so philosopher wrote in Latin" , "'Therefore, to the old Romans (4)'" , "Consequently" , "Therefore (Latin)" , "'Cogito, ---- sum'" .)

I've seen this clue in the LA Times.
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