1. the formation of rings or ring-like structures
Usage: technical; biology
2. the act of making something null and void; cancellation
Usage: formal; legal

Examples

• The annulation of the contract left both parties free to pursue other agreements.
• Scientists observed the annulation process in the developing organism’s cellular structure.
• The court’s annulation of the previous ruling surprised many legal experts.
• Ring annulation is a common synthetic strategy in organic chemistry.
• The annulation of their marriage was finalized after extensive legal proceedings.
• Researchers studied the annulation patterns in the insect’s wing development.