A codicil is literally a "little codex," a little bit of writing on a small piece of writing material, used to add to or change something about a larger piece of writing. A codicil to a will can change the terms of the original will completely, so it generally requires witnesses just like the will itself, though in some states a handwritten codicil may not. In mystery novels, such changes have been known to cause murders; in real life, codicils aren't usually quite that exciting.
Examples of codicil in a Sentence
a codicil to the treaty was necessary to clarify certain provisos that had proved to be ambiguous
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