"nullity" refers to the state of being completely empty, having no value, or a lack of significance. It can also be used to describe a lack of effectiveness or importance. Full definition
The following sub-section provided that: «Nothing in this section shall affect the powers of any court to grant a decree of nullity of marriage.» (newlawjournal.co.uk)
G v G [2013] PRFD (HHJ Altman): Successfully defended an application to set aside an order dismissing a petition for a decree of nullity in divorce proceedings on the basis that the statements and evidence originally put before the court was forged and / or fraudulent. (goldsmithchambers.com)
As I'll explain further below, a Linus Torvalds email that Motorola cited as prior art didn't ultimately persuade the court to stay this case for the duration of a parallel nullity action in the Federal Patent Court. (fosspatents.com)