nullity

n. stat of being null; invalidity; nothingness

Nullity may refer to:Nullity (conflict), a legal declaration that no marriage had ever come into beingThe nullity of a mathematical operator, which is the dimension of its null spaceNullity, a mathematical concept proposed by James Anderson, defined as the value 0/0 and represented by the character Φ
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Noun
1. the state of nonexistence
(synonym) nothingness, void
(hypernym) nonexistence, nonentity
(hyponym) thin air

(n.)
The quality or state of being null; nothingness; want of efficacy or force.
  

(n.)
That which is null.
  

(n.)
Nonexistence; as, a decree of nullity of marriage is a decree that no legal marriage exists.
  

Application to the Court for a declaration that a marriage be declared 'void' or be annulled ie declared never to have existed or to have subsisted until the Court dissolved it