nullity

nul·li·ty   (nŭl'ĭ-tē)    n.   pl. nul·li·ties The state or quality of being null. Something that is null, especially an act having no legal validity.

Main Entry: nul·li·ty
Pronunciation: 'n&-l&-tE
Function: noun
Inflected Form: plural -ties
1 : the quality or state of being null
2 : an act, proceeding, or contract void of legal effect —compare IMPEDIMENT

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absolute nullity
in the civil law of Louisiana : a contract or act considered void by virtue of a transgression of the public order, interest, law, or morals absolute nullity —Louisiana Civil Code>; also : the quality or state of such a nullity
NOTE: A marriage that is an absolute nullity does not have to be annulled to terminate its legal effects (as property rights).

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rel·a·tive nullity
in the civil law of Louisiana : a nullity that can be cured by confirmation because the object involved is considered valid; also : the quality or state of such a nullity
NOTE: A contract that is a relative nullity may be annulled and the parties restored to their original positions. A marriage that is a relative nullity must be annulled to terminate the legal effects (as property rights) of the marriage.