Null and __ (4)

I believe the answer is:

void

(Other definitions for void that I've seen before include "Containing nothing or not legally binding" , "Null or emptiness" , "Blank, invalid" , "Nullify" , "Null and empty" .)

I've seen this clue in the L.A. Times Daily, the LA Times, The Washington Post, the USA Today and the Newsday.

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