Crossword Genius

Proof word (4)

Ross

I believe the answer is:

erat

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">proof word</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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