Crossword Genius

Invalid (4)

Ross

I think it could be either:

void

null

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">invalid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for void that I've seen before include "Empty or vacant, like space" , "Emptiness, empty space" , "Containing nothing or not legally binding" , "Blank, invalid" , "Empty space or vacuum" .)

I've seen this clue in The Guardian, the LA Times, the Universal, The New York Times, the Newsday, the Penny Press, The Mirror, The Irish Independent, the USA Today, The Times and the Evening Standard.
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