Addendum Definition and Meaning: What is Addendum?

Addendum Definition

addendum [əˈdɛndəm]

n pl -da [-də]

1. something added; an addition

2. a supplement or appendix to a book, magazine, etc.

3. (Engineering / Mechanical Engineering) the radial distance between the major and pitch cylinders of an external screw thread

4. (Engineering / Mechanical Engineering) the radial distance between the pitch circle and tip of a gear tooth

Noun 1. addendum - textual matter that is added onto a publication; usually at the end

supplement, postscript

matter - written works (especially in books or magazines); "he always took some reading matter with him on the plane"

back matter, end matter - written matter following the main text of a book

appendix - supplementary material that is collected and appended at the back of a book

continuation, sequel - a part added to a book or play that continues and extends it


noun addition, supplement, extra, extension, attachment, appendix, postscript, affix, adjunct, appendage, augmentation, codicil If you are self-employed, you have to get an addendum to the tax form.

Definition of ADDENDUM


: a thing added : addition


: a supplement to a book —often used in plural but singular in construction

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Examples of ADDENDUM

The letters are included as an addendum to the biography.

<there's an addendum from the author to explain certain stylistic choices that she made>

Francine du Plessix Gray, in an essay first written in 1991 and updated with an addendum here, writes eloquently of a lifelong obsession with weight loss, stemming from the harsh judgments of a mother enraptured by fashion. —Ginia Bellafante, New York Times Book Review, 21 Sept. 2008

Origin of ADDENDUM

Latin, neuter of addendus, gerundive of addere

First Known Use: 1684

Related to ADDENDUM

Synonyms: afterword, appendix, codicil, excursus, supplement

Antonyms: foreword, introduction, preface, prologue (also prolog)

Rhymes with ADDENDUM

agendum, pudendum

What is an Addendum?

An addendum is a document that you need to fill in as part of your application requirements to some programmes. Many post-graduate programmes require an addendum.

A 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.

Definition of addendum

noun (plural addenda /-də/)

1 An item of additional material added at the end of a book or other publication.

2 Engineering the radial distance from the pitch circle of a cogwheel or wormwheel to the crests of the teeth or ridges. Compare with dedendum.

Meaning of Addendum

The word addendum comes from the Latin word addere, meaning “to add.” An addendum is an addition to a piece of writing — a document, publication, or book, for example — that modifies, clarifies or adds to a specific part of the original written work. One of the most important aspects of an addendum is that it is added before the document is executed. Once added, it becomes part of the original document.

Addendums are often used with legal contracts to add or specify conditions to the contract. Real estate transactions commonly use addendums to specify financial or home inspection requirements for securing a mortgage. A renter may sign an addendum to the lease agreement if special rules apply to him, such as conditions for allowing him to have a pet. In construction, an addendum may be used during the initial bidding to further clarify what will be provided via the contract.

When an addendum is added to a contract, it is normally signed in the presence of a witness, just as the original contract is. It may even be notarized in some cases. By signing, the parties involved indicate that they agree to the stipulations as outlined. In other cases, a signature may not be required, as the document is not a contract. In architecture, for example, it might contain drawings that clarify or modify a project. A book may contain an addendum that further explains some part of it, such as an appendix.

Sometimes an addendum is confused with an amendment, but they are two different types of additions. The primary difference is that an addendum is added before the document is executed, while an amendment is added after the document is executed. The addendum is agreed upon, signed if it is part of a contract, and presented as part of the original document. An amendment may be added at any time after the original document has been presented, and is usually used to make changes to the original document. Therefore, the two terms have specific proper uses and are not interchangeable.

Addendum To A Contract.

What is an addendum to a contract?

Do not confuse an addendum with an amendment. In real estate they are two specifically different things. This can be confusing and it can also lead to problems if you word either one wrong. So what is an addendum to a contract?

Let me first explain amendments. An amendment is an alteration of the original agreement. This can be any thing from price to when the seller vacates. For instance, an amendment can be used to during negotiations to counter an offer already made. An example would be the buyer has offered to pay X amount of money for the property with the following conditions. Things like the kitchen appliances stay and so do the laundry room ones. The seller can add an amendment which states the washer is going but every thing else stays.

An addendum is part of the original contract. It is another section or part which is very specific in what it says. For instance if the buyer is making an offer on a farm, he or she may want to clarify the terms in more detail. Terms like what is to happen to the crops already planted, or if any of the farm equipment stays can be clearly marked out in an addendum.

The addendum becomes part of a legal and binding contract. The amendments are parts of a contract still in negotiations. The addendum will stand up in court. The amendments will just show what everyone was thinking. If you ever did have to go to court over the contract, it is a good idea to have both the final copy, with the addendum, and the rough draft with the amendments. It can give the judge a better idea of what was trying to be represented during the formulation of the contract.

A contract can have many addendums. Each one can be specific about certain aspects of the sale. Think of them as if then clauses. For instance, if the water supply in the well is not potable but safe for other uses, the buyer can specify the seller must drill a new well. The addendum can specify where the well is to go and who will drill it. Amendments can be made to an addendum which states, in this case, the well driller will decide where the well is to be placed.

Because an addendum is a legal and binding part of a contract, you must choose your wording carefully when adding it to the original contract. The addendum to a contract can include just about anything either party wants to clarify. It is important to realize the original contract should also include wording such as "see attached addendum" or "addendum attached" so that there is no dispute later on should a question come up. There have been times the wording was not in the original contract and the addendums not attached to the documentation when a case was presented in court. This caused the courts some concern as to what was valid and what was not allowed. In the end, the addendum did help to win the case. However, if the single phrase "addendum attached" had been in the original contract there would have been no questions.

Definition of 'Addendum'

An attachment to a document such as an insurance policy that changes the original policy conditions, either to include or exclude coverage. The addendum becomes part of the legal contract.  

Explanation of 'Addendum'

In insurance, endorsement is an addendum attached to the original policy that alters or replaces the previous provisions.

In real estate purchase agreements, an addendum is a document containing any changes or modifications negotiated in the original lease. Usually, an addendum is attached to the signed lease, as a part of the lease, and describes financing terms and property inspection requirements.

For contracts, if the addendum alters a contract, which has already been signed by all parties, it is known as an amendment.  

Addendum sentence examples

  • Addendum to CTO report the CTO presented addendum to his report, a copy of which had been previously circulated to each member.

  • Copies of the new addendum are now available to purchase, at a cost of GBP £ 50.

  • Addendum source: Fabio Picasso Type: E 63.

  • This study has resulted in a 58 page addendum to his book.

  • Addendumntries may appear as addenda at the end of a volume.

  • Addendumr, some of the other addenda sit more awkwardly.

  • Addendumstern addenda panel is the one nearest the town side.

  • See addendum to the RICS post graduate diploma in property investment prospectus.

  • This second addendum is appended below in plain text.

  • Addendum form for third level colleges in the republic of Ireland to subscribe to additional products.

  • Addendum developed the strategy of inserting personal messages into secret addenda - which were nevertheless sometimes intercepted.

  • I would provide an addendum mentioning both sleep deprivation and frostbite.

  • Work on the first addendum has reached the final ISO balloting stage.

  • Addendum report.

  • Note - at the time of writing this addendum, I have not visited Metalink to read up the details of any bugs reported.

  • Archive for august 24th, 2005 simplicity is hard work a quick addendum to the earlier post about business investment in blogging.

  • Addendum sheet is made.

  • Councilor Hussey proposed an addendum to his proposal that its contents receive clearance from DARD.

  • Vat to be levied in all cases to cover the administration costs in preparing an addendum or deed of variation to the tenancy agreement.
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