codicil — English Dictionary

Noun

1. An addition or supplement that explains, modifies, or revokes a will or part of one.

2. An addition or supplement modifying any official document, such as a treaty.

   Examples

   So insistent was this demand that the Wyandot actually received a codicil to the treaty […]

   More examples (1)

   Those loose ends were tied up in a little-understood clarification of Brexit called the Northern Ireland protocol, ratified in January 2020. It looked like a mere codicil three years ago; now it looks like a serious diplomatic blunder that could threaten Britain’s territory and the region’s peace.

3. Any appendix or addition.

   Usage

   • broadly

   Examples

   If Nick answered a question Wani listened to him and then gave a flat little codicil or correction.

Verb

1. To add a codicil (to).

   Usage

   • ergative

Noun

1. a supplement to a will; a testamentary instrument intended to alter an already executed will

   Broader terms

   appendix