What is the legal term for a modification or addition to an existing will?

The legal term for a modification or addition to an existing will is a codicil. A codicil allows individuals to make changes to their will without the need to create an entirely new document. This is particularly useful for minor changes, such as updating an executor or changing specific bequests. A codicil must be executed with the same formalities as the original will, including signature and witness requirements, to ensure its validity.

In contrast, other terms such as an amendment generally refer to altering a document but are not specifically the legal terminology used in the context of wills and testaments. A bequest pertains to the act of giving or the specific item being given through a will, while an affidavit is a sworn statement used in legal contexts but does not pertain to modifications of wills. Understanding the distinction between these terms helps clarify the specific legal language used in estate planning and testamentary documents.