Vary or VariationThis is when an existing court order is altered in some way. To do this you would need to make an application to the court.
Vexatious LitigantThis is an individual who makes unnecessary and/or repetitive applications to the court in existing proceedings to harass the other party and delay the case. Their applications are often without merit.
Void MarriageThis is a marriage where the legally requirements of marriage were not met thus making the marriage void. Another word for this is annul/annulment/nullity.