Crossword Genius

Proof word (4)

Ross

I believe the answer is:

erat

'proof word' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for erat that I've seen before include "The E of QED" , "Quod - - demonstrandum (QED)" .)

I've seen this clue in the LA Times.
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