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Adendum vs. Addendum — Which is Correct Spelling?

By Tayyaba Rehman — Updated on April 4, 2024
"Adendum" is an incorrect spelling, while "Addendum" is correct. An addendum is an additional section added to a document or book.
Adendum vs. Addendum — Which is Correct Spelling?

Which is correct: Adendum or Addendum

How to spell Addendum?


Incorrect Spelling


Correct Spelling

Key Differences

"Addendum" has two 'd's, think of it as "ad-dendum" to emphasize the addition.
Associate "Addendum" with "Addition"; both start with "Add."
Remember it as “Add-” followed by “-endum” to highlight the action of adding something.
Visualize an added page as an “addendum” to a book, focusing on the "add" part.
Think of "Addendum" as addingendum, where you're adding an endum (section) to a document.

How Do You Spell Addendum Correctly?

Incorrect: An adendum is needed to address these issues.
Correct: An addendum is needed to address these issues.
Incorrect: Please include an adendum with your report.
Correct: Please include an addendum with your report.
Incorrect: The book's adendum contains important updates.
Correct: The book's addendum contains important updates.
Incorrect: Adendum to the contract was signed yesterday.
Correct: Addendum to the contract was signed yesterday.
Incorrect: He forgot to read the adendum attached to the email.
Correct: He forgot to read the addendum attached to the email.

Addendum Definitions

An appendix or attachment to a legal or formal document.
The lawyer attached an addendum to include the missing clauses.
A supplementary material appended to a document.
The author added an addendum to clarify certain points.
An item added to a settled list or document.
The contract had an addendum for the newly discussed terms.
An addition made to correct or improve a book or written work.
The revised edition includes an addendum addressing recent events.
An addendum or appendix, in general, is an addition required to be made to a document by its author subsequent to its printing or publication. It comes from the Latin gerundive addendum, plural addenda, "that which is to be added," from addere (lit. ''give toward'', compare with memorandum, agenda, corrigenda).
An item of additional material added at the end of a book or other publication.
The radial distance from the pitch circle of a cogwheel or wormwheel to the crests of the teeth or ridges.
Something added or to be added, especially a supplement to a book.
Something to be added; especially text added as an appendix or supplement to a document.
A postscript.
(engineering) The height by which the tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line.
A thing to be added; an appendix or addition.
Textual matter that is added onto a publication; usually at the end

Addendum Meaning in a Sentence

The addendum to the manual explains the new features.
The teacher asked for an addendum to include more examples.
The addendum at the end of the book lists corrections.
Every contract should have an addendum for additional clauses.
An addendum was added to clarify the terms and conditions.
The policy's addendum includes exceptions and exclusions.
The legal document was complete after adding an addendum.
Please review the addendum for any necessary corrections.
Before publication, the author added an addendum.
The meeting minutes will have an addendum with further details.
An addendum was necessary to update the software license agreement.
An addendum to the agreement specified the payment terms.
The addendum specifies the responsibilities of each party.
The addendum to the lease agreement outlines pet policies.
The construction plans were updated with an addendum for safety measures.
The addendum in the report provides the latest data.
The project proposal includes an addendum with budget adjustments.
After feedback, the plan was revised to include an addendum.

Common Curiosities

Why is it called Addendum?

It is called "Addendum" because it refers to something that is added or appended to a document or book.

Which vowel is used before Addendum?

The vowel "a" is used.

What is the pronunciation of Addendum?

It is pronounced as [uh-DEN-duhm].

What is the singular form of Addendum?

The singular form is "Addendum."

What is the verb form of Addendum?

The word "addendum" is a noun. There isn't a direct verb form. However, "add" is a related verb.

What is the root word of Addendum?

The root is Latin, derived from "addere" which means "to add."

Which preposition is used with Addendum?

The preposition "to" can be used as in "addendum to a document."

What is the plural form of Addendum?

The plural form is "Addenda."

Which article is used with Addendum?

Both "an" and "the" can be used, depending on the context. Typically, "an addendum."

Is Addendum a collective noun?

No, it is not a collective noun.

Is Addendum a noun or adjective?

Addendum is a noun.

Is Addendum an abstract noun?

Yes, it can be considered an abstract noun as it refers to an additional section or concept and not a physical object.

Is Addendum a countable noun?

Yes, it is countable. E.g., two addenda.

Is the word Addendum is imperative?

No, it is not imperative.

What is another term for Addendum?

Appendix or supplement.

Which conjunction is used with Addendum?

No specific conjunction is solely associated with "addendum". Any suitable conjunction can be used depending on the sentence.

Is the word Addendum is Gerund?

No, it is not a gerund.

Is the word “Addendum” a Direct object or an Indirect object?

"Addendum" can be a direct object, e.g., "She wrote an addendum."

What is the opposite of Addendum?

There isn't a direct opposite, but one might consider "deletion" in the context of removing content.

Is Addendum a negative or positive word?

It is neutral; neither negative nor positive.

Is the Addendum term a metaphor?

No, it is not a metaphor.

What is the first form of Addendum?

Addendum (it's a noun, so it doesn't have verb tenses).

What is the second form of Addendum?

Not applicable.

What is the third form of Addendum?

Not applicable.

How is Addendum used in a sentence?

"The author included an addendum to address reader feedback."

Is Addendum an adverb?

No, it is not an adverb.

Is Addendum a vowel or consonant?

"Addendum" is a word that contains both vowels and consonants.

What part of speech is Addendum?


How many syllables are in Addendum?


How do we divide Addendum into syllables?


What is the stressed syllable in Addendum?


Which determiner is used with Addendum?

It depends on the context. "This," "that," "an," or "the" could all work.

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Author Spotlight

Written by
Tayyaba Rehman
Tayyaba Rehman is a distinguished writer, currently serving as a primary contributor to As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.

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