Document or information attached or added to clarify, modify, or support the information in the original document or written work. In construction industry, for example, an addendum issued by a client during the bidding process becomes part of the contract documents when the contract is awarded.

Use addendum in a sentence

  • The old man had his lawyer add an addendum to his existing will to be sure that his grandchild would inherit 25% of his fortune, which would leave 75% to his two children.

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  • Many people don't read their contracts and therefore don't realize that many have an addendum which could make things very difficult in the future.

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  • The client wanted his lawyer to attach an addendum to the original contract which would allow him to make changes to his building.

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