The union was considered invalid because it had not been approved by the king and the Privy Council.

Although a second species had been established before the revision, the genus name Dixeya was considered invalid because its type belonged to another genus.

Both these botanic names are considered invalid as they are later than microphylla.

Insurance is considered invalid if the driver is under the influence of alcohol or drugs.

Because she left the convent to marry Henry, her second marriage was considered invalid and the couple split.

As such, the genus was considered invalid until Hochberg resurrected it in 1998.

A pilgrim's Hajj is considered invalid if they do not spend the afternoon on Arafat.

The ballots are then immediately destroyed, with the exception of those considered invalid or challenged by the candidates' representatives, which are retained for further scrutiny.

All reported lost/stolen passports are considered invalid and placed into a U.S. port of entry database.

Of these taxa, cordeauxi, gubanensis and erlangeri were considered entirely invalid in 1978.