1. a person or thing that nullifies, cancels, or makes something void
2. a supporter of nullification, especially the doctrine that states can reject federal laws
Usage: historical; U.S. politics

Examples

• The new evidence served as a nullifier of the previous testimony.
• The judge acted as a nullifier when he dismissed the case.
• Southern nullifiers opposed federal tariff laws in the 1830s.
• The contract contained a nullifier clause that voided the agreement under certain conditions.
• Critics called him a nullifier of constitutional authority.
• The software update included a nullifier for the previous security patch.
• Historical nullifiers believed states could ignore federal mandates.