If you are unsure whether to write acknowledgement or acknowledgment, the short answer is: both spellings are correct. The main difference is regional usage. Acknowledgment is the usual American English spelling, while acknowledgement is especially common in British English and other varieties that follow British spelling conventions. Major dictionaries, including Cambridge and Oxford, recognize both forms.
The choice matters most when you are writing for a specific audience, university, company, publisher, or country. Using one spelling consistently is more important than treating the other as a mistake.
This guide explains the difference, when to use each form, what the word means, how it works in professional and academic writing, common mistakes, and a simple way to remember the spelling.
Quick Answer: Acknowledgement or Acknowledgment?
Acknowledgment and acknowledgement have the same meaning and pronunciation. The difference is mainly spelling by regional variety.
- American English: acknowledgment is generally preferred.
- British English: acknowledgement is widely used, although acknowledgment is also accepted.
- Canadian and other English varieties: usage can vary, so follow the style guide used by your organization or publication.
Examples
- US: Thank you for your acknowledgment of my application.
- UK: Thank you for your acknowledgement of my application.
- Academic: The author included acknowledgements to thank the research team.
Memory tip: If your writing follows US spelling, usually drop the e: acknowledgment. If it follows British spelling, acknowledgement is a natural choice.
What Does “Acknowledgment” or “Acknowledgement” Mean?
The noun comes from the verb acknowledge, which means to accept, recognize, admit, or show that something has been noticed or received.
Cambridge gives several related meanings, including accepting that something is true, expressing thanks, and confirming receipt of something. Oxford likewise lists meanings involving recognition, thanks, receipt of a letter or email, and the section of a book in which an author thanks contributors.
So acknowledgment/acknowledgement can refer to several things:
| Meaning | Example |
| Recognition of a fact | His statement was an acknowledgment of the problem. |
| Expression of thanks | She received an award in acknowledgment of her contribution. |
| Confirmation of receipt | We sent an acknowledgment of your application. |
| Recognition of someone’s presence | He gave her a nod of acknowledgment. |
| Thanks in a book | The author included acknowledgments at the beginning of the book. |
Why this matters
The spelling question is simple, but the word itself is broader than “saying thank you.” It can describe recognition, admission, confirmation, or appreciation.
Key takeaway: The noun refers to an act or statement of recognizing, accepting, confirming, or expressing thanks.
Acknowledgment vs Acknowledgement: The Main Difference
There is no difference in meaning between the two spellings.
The difference is primarily one of regional spelling preference.
| Feature | Acknowledgment | Acknowledgement |
| Meaning | Same | Same |
| American English | Preferred | Also understood |
| British English | Accepted | Common/preferred |
| Pronunciation | Same | Same |
| Singular | acknowledgment | acknowledgement |
| Plural | acknowledgments | acknowledgements |
| Verb | acknowledge | acknowledge |
Cambridge explicitly lists acknowledgment with acknowledgement as an alternative, while Oxford’s entry for acknowledgement also identifies acknowledgment as another form.
Collins similarly records both forms and distinguishes American and British usage.
Why are there two spellings?
The difference reflects a broader pattern in English spelling. American English often removes the e in certain words ending in -ment, while British English may retain it.
For example:
- acknowledgment / acknowledgement
- judgment / judgement
- abridgment / abridgement
However, do not assume that every word follows exactly the same pattern. English spelling has many historical exceptions, so each word should be checked individually.
Key takeaway: Think of the two forms as regional variants, not different words.
When Should You Use “Acknowledgment”?
Use acknowledgment when your document follows American English spelling.
This is a good choice for:
- US business correspondence
- American university assignments
- US corporate websites
- American publications
- American academic or professional documents
- Software and product documentation written in US English
Examples
Business email
We appreciate your acknowledgment of the revised contract.
Academic writing
The study provides an acknowledgment of the limitations of the earlier model.
Book
The author included a short acknowledgment of the editors’ assistance.
Customer service
You should receive an acknowledgment of your application within three business days.
If the rest of your document uses forms such as color, organization, and center, acknowledgment will usually fit the same American English style.
Key takeaway: Choose acknowledgment when consistency with American English is your priority.
When Should You Use “Acknowledgement”?
Use acknowledgement when you are following British English spelling conventions.
It is appropriate in contexts such as:
- UK business writing
- British university assignments
- UK publications
- British English websites
- Organizations using British English style
- Academic work following a British institutional style guide
Examples
University
The dissertation includes an acknowledgement section thanking the research participants.
Formal letter
Please send an acknowledgement confirming receipt of the documents.
Professional communication
We would appreciate an acknowledgement of the revised schedule.
Oxford lists acknowledgement as the main entry and identifies acknowledgment as an alternative, while Cambridge also recognizes both forms.
Key takeaway: If your document follows British English, acknowledgement is a safe and natural choice.
Which Spelling Should Students Use?
Students should follow the spelling system required by their school, university, instructor, or academic style guide.
There is no universal rule saying that one spelling is “more correct.”
For example, a student writing in American English might write:
Acknowledgments
A student writing in British English might write:
Acknowledgements
Both can be correct when used consistently.
A practical academic decision
Ask:
What English variety does my institution use?
↓
American English?
→ Use acknowledgment.
British English?
→ Use acknowledgement.
Institutional style guide specifies another form?
→ Follow the style guide.
This is especially important in dissertations, theses, research papers, and published academic work because consistency is part of good editorial practice.
Expert tip: Do not change spellings simply because a spellchecker flags one form. First check which English variety your document is supposed to use.
How Is “Acknowledgment” Used in Academic Writing?
The word has a particularly recognizable role in books, theses, dissertations, and research papers.
An acknowledgments/acknowledgements section is where an author thanks people or organizations that contributed to the work. Oxford and Cambridge both recognize this use.
For example:
Acknowledgments
I would like to thank my supervisor for her guidance throughout this research project.
The section may mention:
- supervisors
- research assistants
- colleagues
- institutions
- funding bodies
- editors
- participants
- family members
Important distinction
An acknowledgment section is not the same as a bibliography or reference list.
A reference list identifies sources used in the work. An acknowledgment section expresses thanks or recognizes assistance.
For example:
I thank Professor Khan for reviewing an early draft.
This belongs in an acknowledgment section.
But:
Khan, A. (2025). Title of research paper…
belongs in the appropriate reference system.
Key takeaway: Academic acknowledgments recognize people, assistance, or support; references document sources.
“Acknowledgment of Receipt” vs “Acknowledgement of Receipt”
Both versions are grammatically correct:
- Acknowledgment of receipt
- Acknowledgement of receipt
The phrase means a confirmation that something has been received.
Oxford specifically gives acknowledge the formal meaning of telling someone that something they sent has been received, including the phrase acknowledge receipt of.
Examples
Please send an acknowledgment of receipt.
We have received your application and will issue an acknowledgement shortly.
Kindly acknowledge receipt of the attached documents.
This wording is common in formal business, administrative, legal, and professional communication.
A useful distinction
Acknowledgment of receipt means:
“We received it.”
It does not necessarily mean:
“We agree with it.”
For example, a company can acknowledge receipt of a complaint without agreeing with the complaint.
That distinction can matter in formal communication.
Key takeaway: An acknowledgment of receipt confirms delivery or receipt; it does not automatically indicate agreement or approval.
Common Mistakes With Acknowledgment and Acknowledgement
Mistake 1: Treating one spelling as universally correct
Wrong assumption:
“Acknowledgement is incorrect.”
Better understanding:
Both spellings are established English forms. Cambridge and Oxford recognize both.
Mistake 2: Mixing regional spellings
A document may contain:
organization, color, acknowledgment, and acknowledgement
The individual words may each be understandable, but the document has inconsistent spelling conventions.
Better approach: Pick one English variety and apply it consistently.
Mistake 3: Confusing the noun with the verb
The verb is:
acknowledge
The noun is:
acknowledgment / acknowledgement
Do not write:
She acknowledgemened the email.
Correct:
She acknowledged the email.
Mistake 4: Assuming acknowledgment means only “thanks”
The word can describe recognition of a fact, confirmation of receipt, or recognition of someone’s contribution.
For example:
The report was an acknowledgment of the company’s failure.
Here, the meaning is closer to recognition or admission, not gratitude.
Mistake 5: Changing a quotation to match your preferred spelling
If you are quoting a source, preserve the original wording unless your editorial rules specifically allow changes.
If a British source uses:
acknowledgement
an American editor should not casually change the quotation to:
acknowledgment
Key takeaway: Most errors come from confusing regional spelling with correctness or from failing to maintain consistency.
Acknowledgment or Acknowledgement: Which One Is More Formal?
Neither spelling is inherently more formal.
Acknowledgment is not less professional because it lacks the e, and acknowledgement is not more sophisticated because it contains it.
Formality comes from the context and sentence, not the extra letter.
Compare:
Thanks for the acknowledgment.
with:
Please provide written acknowledgment of receipt of the documents.
The second sounds more formal because of the wording and situation, not because of the spelling.
Key takeaway: Spelling variation does not determine tone.
Acknowledgment vs Recognition vs Admission
These words overlap, but they are not always interchangeable.
| Word | Typical idea | Example |
| Acknowledgment | Recognizing, accepting, confirming, or expressing thanks | Her acknowledgment of the problem was important. |
| Recognition | Identifying or accepting something as significant, valid, or known | The scientist received recognition for her work. |
| Admission | Accepting that something is true, often something unfavorable | His admission of responsibility ended the dispute. |
| Appreciation | Showing gratitude or valuing something | She expressed appreciation for the team’s help. |
| Confirmation | Verifying that something is true or has been received | We sent confirmation of the booking. |
The distinction becomes useful in professional writing. Acknowledgment is broad; admission often carries a stronger sense of accepting an uncomfortable fact.
Oxford’s thesaurus-style discussion of acknowledge similarly distinguishes it from admit, recognize, concede, and confess.
Key takeaway: Choose the synonym based on the exact relationship you want to express, not simply because the words look similar.
Pronunciation
The two spellings are pronounced the same.
Cambridge gives approximately:
- UK: /əkˈnɒl.ɪdʒ.mənt/
- US: /əkˈnɑː.lɪdʒ.mənt/
for the noun.
The spelling difference therefore does not normally create a pronunciation difference.
A useful way to hear the structure is:
ack-NOL-ij-ment
The first syllable is unstressed, while the main stress falls around NOL.
Memory tip: You pronounce the word the same way whether you keep or remove the e.
A Simple Editing Decision Guide
If you are editing a document and cannot decide which form to use, follow this process:
1. Is the document written in American English?
→ Use acknowledgment.
2. Is it written in British English?
→ Use acknowledgement.
3. Is the organization using a house style?
→ Follow that style, even if it differs from your personal preference.
4. Is the word inside a quotation?
→ Normally preserve the source’s spelling.
5. Are you editing a document that already uses one form consistently?
→ Keep the existing form unless you are deliberately changing the document’s style.
This approach is better than asking which spelling is “the real one,” because both forms are recognized.
Professional Writing Tip: Consistency Beats Preference
Editors often spend too much time debating individual variants when the more important issue is consistency.
Suppose a company website uses British English throughout:
- organisation
- colour
- centre
- acknowledgement
Changing only acknowledgement to acknowledgment does not necessarily improve the copy. It may make the style less consistent.
Likewise, an American document using:
- organization
- color
- center
- acknowledgment
should not switch randomly to British forms.
Editorial rule of thumb: Decide the language variety first, then make spelling choices within that system.
FAQ
Is “acknowledgement” a correct spelling?
Yes. Acknowledgement is a correct English spelling and is especially common in British English. Cambridge and Oxford both recognize it.
Is “acknowledgment” a correct spelling?
Yes. Acknowledgment is the standard American English form and is also recognized in British English as an alternative.
Which is correct in American English?
Acknowledgment is generally the preferred American spelling.
Which is correct in British English?
Acknowledgement is widely used in British English, although acknowledgment is also accepted.
Does “acknowledgement” have a different meaning?
No. The two spellings have the same core meanings. The difference is spelling, not meaning.
What is the plural of acknowledgment?
The American form is acknowledgments. The British form is commonly acknowledgements.
Is “acknowledgment of receipt” correct?
Yes. It means a confirmation that something has been received. The British spelling is acknowledgement of receipt.
Should a thesis use “acknowledgment” or “acknowledgement”?
Follow your university’s required English variety or style guide. If none is specified, use the spelling consistent with the rest of your thesis.
Is “acknowledgement” more formal than “acknowledgment”?
No. Neither spelling is inherently more formal. Regional convention determines the spelling.
Can I use both spellings in the same document?
Technically, readers will understand both, but professional editing generally favors consistency. Choose the form that matches your document’s English variety or house style.
Is “acknowledge” the verb form?
Yes. Acknowledge is the verb; acknowledgment/acknowledgement is the noun. Cambridge defines acknowledge as accepting, admitting, or recognizing something, among other uses.
Key Takeaways
- Acknowledgment and acknowledgement are both correct.
- Acknowledgment is generally preferred in American English.
- Acknowledgement is widely used in British English.
- The two forms have the same meaning and pronunciation.
- The noun can mean recognition, admission, thanks, or confirmation of receipt.
- In academic writing, acknowledgments/acknowledgements can refer to a section thanking people who contributed to a book, thesis, or research project.
- Your audience, institutional style, and overall spelling system should determine your choice.
- Consistency is more important than personal preference.
Editorial Note
For professional or academic publishing, the safest approach is not to label one spelling as “wrong.” Both are established forms. Instead, identify the English variety required by the publication, institution, client, or style guide and apply it consistently.
A good editor also distinguishes spelling from meaning: changing acknowledgement to acknowledgment does not change what the word means.
References
- Cambridge Dictionary — acknowledgment
- Cambridge Dictionary — acknowledgement
- Cambridge Dictionary — acknowledge
- Oxford Learner’s Dictionaries — acknowledgement
- Oxford Learner’s Dictionaries — acknowledge
- Collins English Dictionary — acknowledgment
Strong Conclusion
So, acknowledgement or acknowledgment? Both are correct. Use acknowledgment for standard American English and acknowledgement when following British English conventions. If you are writing for a school, employer, publisher, or international audience, let its style guide make the final decision.
The simplest rule to remember is this: choose the spelling that matches your English variety, then use it consistently.
David James is an English language enthusiast, writer, and author at StudyNixx, a website dedicated to helping readers understand confusing English words, spelling differences, and commonly mistaken word forms. He focuses on making English language learning simple, practical, and easy to understand.
David is also the author of two books on English language and word usage, where he explores common spelling mistakes, confusing words, and practical ways to improve written English. Through his writing and educational content, he helps students, writers, and everyday English learners choose the right words with confidence.
At StudyNixx, David covers common word comparisons such as summary vs. summery, shiny vs. shiney, spicy vs. spicey, and breached vs. breeched. His goal is to provide clear, useful, and reliable explanations that make English spelling and word usage easier for everyone.