nullˈity noun

1. The state of being null or void
2. Something without legal force or validity
3. Nothingness
4. Lack of existence, force or efficacy

nullˈness noun

null-modem cable noun (computing)

A special cable used to link two PCs

decree of nullity

A decree that a marriage has never legally existed, eg because of a failure to publish the banns properly

null and void

1. Without legal force
2. Not valid or binding