Duhaime's Law Dictionary

Addendum Definition:

An attachment to a written document.

Related Terms: Treaty

In Trent v. PPG Industries, Justice Lanchard of the Court of Appeal of Louisiana wrote:

"An addendum is something which is added, such as a section of added material. Thus, by its very nature, it would neither be numbered sequentially nor, necessarily, appear before other attachments to a contract."

The Australian Legal Dictionary definition is helpful though focusing on international law:

"Something to be added.

"An addition to a treaty negotiated after signing of the treaty. An addendum to a treaty must be ratified separately by a member state of the treaty; ratification of the original treaty does not imply ratification of the addendum."


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