The Collaborative International Dictionary of English v.0.48:

Nihility \Ni*hil"i*ty\, n. [Cf. F. nihilit['e]. See Nihilism.]
   Nothingness; a state of being nothing.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nihility
    n 1: the state of nonexistence [syn: nothingness, void,
         nullity, nihility]