The state or quality of not existing, or the absence of everything; emptiness or void.
From Old English 'nān' (none) + '-thing' (a thing) + '-ness' (state or quality). The word combines Germanic roots to express the philosophical concept of non-existence.
Philosophers and physicists have been obsessed with nothingness for millennia—from Eastern Buddhism's concept of void to modern quantum mechanics discovering that 'empty' space is actually seething with virtual particles popping in and out of existence.
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