Both "defence" and "defense" are correct English. "Defence" is British and Commonwealth spelling, "defense" is American, and your department's required English convention decides which to use in your project. The real rule is not which is right in general but which one your supervisor, department and university expect, and that you use it everywhere.
Consistency matters across the written report as well as its title. UniDraft helps organise your confirmed material and instructions into an editable project document, seminar report or SIWES report. Start your document, supply the spelling convention your supervisor requires and review the result. It does not prepare or deliver the oral defence.
The short answer
- Defence = British/Commonwealth spelling. Defense = American spelling. Same word, same meaning.
- Use defence by default in a Nigerian project, seminar or SIWES report unless someone with authority over your work says otherwise.
- The verb defend is spelled the same in both. The noun changes: "project defence" (British) or "project defense" (American).
- Rule order when they disagree: supervisor's instruction, then department guideline, then university style, then British English by default.
- Set Word's proofing language to match, then check that you have not mixed the two.
Which one is correct? What dictionaries actually say
Dictionaries treat the two spellings as variants of one word. Dictionary.com, for example, labels "defence" as the British variant of the American "defense". The GOV.UK style guide, which governs how the UK government writes, tells its authors to use UK spelling and gives "organise" rather than "organize" as an example, and it lists "defence" as the standard form. Wiktionary describes the noun spelling "defence" as mainly used in the UK, Australia, Canada, Ireland and New Zealand, with "defense" more common in the United States.
None of that makes "defense" a mistake. It makes it the American form. In an American university it would be correct and "defence" would be the one a marker corrects.
Why "British" is the sensible default in Nigeria
Nigerian English developed from British English during the colonial period, and this is why textbooks, lecturers' notes, past projects and departmental documents in Nigeria mostly follow British forms. The Wikipedia entry on Nigerian English describes it as based on British English, though it also notes that Nigerian English has developed features of its own, so treat "British spelling" as a strong default, not a legal requirement. I could not find any Nigerian regulator (NUC, NBTE or ITF) that publishes a national rule on British versus American spelling for student projects. That means the rule that binds you is local: your department, your university, your supervisor.
That is why a spelling question belongs among your formatting questions. It sits beside margins, line spacing, chapter numbering and referencing style, all of which vary by institution. Our guide to formatting a final year project for a Nigerian university covers those, and the spelling convention is the same kind of decision.
Defence versus defense in the sentences you will actually write
The noun is where the difference shows up, and it appears in more sentences than you might think:
| British | American |
|---|---|
| project defence | project defense |
| oral defence | oral defense |
| defence panel | defense panel |
| defence of the thesis | defense of the thesis |
| defenceless | defenseless |
| the Ministry of Defence (UK body name) | the Department of Defense (US body name) |
Two points stop people from over-correcting:
- "Defend", "defended", "defending" and "defender" do not change. Do not write "defense your project" or "defence your project". The verb is "defend".
- Proper names keep their own spelling. If your project quotes the title of a report or the name of an organisation, copy it exactly as it is written, even when it differs from your convention.
Other British spellings you should expect
Once you decide on British spelling, apply it to the whole document. These are the pairs students most often mix up in project reports.
-ise or -ize?
British usage widely uses "-ise" (organise, realise, recognise, summarise), and the GOV.UK guide gives "organise" as its example. There is one wrinkle: the Oxford tradition, which is also British, prefers "-ize" (organize) while still writing "analyse", "colour" and "defence". If you see "organize" in a British-published book, that is Oxford spelling, not American. For a Nigerian student the simple rule is to use "-ise" and remain consistent, unless your department's material uses "-ize" throughout, in which case follow the department.
-yse, never -yze
For the examples here, British spelling uses "-yse": analyse, paralyse, catalyse. "Analyze" is American. In a results chapter this word appears constantly ("the data were analysed using SPSS"), so it is worth getting right.
-our, -re and doubled consonants
- -our: colour, behaviour, favour, honour, labour, neighbour
- -re: centre, metre, litre, theatre, fibre
- Doubled l before a suffix: labelled, modelling, travelled, cancelled (GOV.UK gives "modelling" not "modeling")
Metre and litre matter in engineering and science reports. Keep in mind that units in a table are symbols (m, L), so the spelling rule applies to the words in your sentences, not to the symbols.
Programme and program
In British English, "programme" is used for a course or plan, such as "the degree programme", "the training programme", "the SIWES programme". A computer program is spelled "program" in both British and American English. So a Computer Science project can quite correctly contain both "programme" (degree programme) and "program" (a piece of software) in the same paragraph.
Licence and license
British English splits the noun and verb: "a driving licence", but "to license a product". American English uses "license" for both. If you cite a software or software licence in your project, this pair is worth checking.
Cheque and grey
Two everyday examples are "cheque" (the payment slip) and "grey". Wikipedia's summary of spelling differences lists cheque and grey as British forms. Do not worry about learning every rare pair. Check the examples above and run Word's spell checker set to British English for the rest.
What to do if your department or supervisor says otherwise
This happens more than students expect, and the answer is short. Follow the person or document with the most authority over your grade, even if it conflicts with the British default. The fixed order is:
- Project or supervisor instructions. If your supervisor writes "use American spelling" or corrects "defense" to "defence" on your draft, that is your rule, whether or not it is what a style book says. Keep the instruction (screenshot the marked-up page or save the email) because it settles disagreements later with a second reader such as the HOD or an external examiner.
- Student-confirmed guidelines, then department patterns. Many departments issue a document covering chapters, fonts, spacing and referencing. Read it for a stated spelling convention, and also notice which spelling it uses about itself. If the handbook says "defence" everywhere, that is a strong hint.
- Your university's style or thesis regulations. Postgraduate schools tend to have written regulations for dissertations. Undergraduate rules are often less formal.
- British English. If none of these say anything, this is the sensible default in Nigeria.
Send a one-line question, not a debate
If you cannot find the rule, ask your supervisor instead of guessing: "Sir/Ma, should I use British spelling (defence, organise) throughout the project?" Most supervisors answer in one line. Keep the answer with your project files. If a supervisor gives an instruction that later changes, our article on managing supervisor corrections without losing earlier work explains how to keep your versions in order, so a spelling change does not leave half a document in the old convention.
What if two supervisors or panellists disagree?
Occasionally a co-supervisor or an external examiner prefers the other spelling. Do not argue about the point at the defence. Follow the most recent written instruction from your main supervisor, and tell the panel in a sentence if asked: "I followed British spelling as instructed by my supervisor." Your actual assessment criteria determine how spelling is treated. Resolve conflicting instructions through the responsible supervisor rather than predicting marks.
What if my project is about an American topic or uses an American source?
Keep your own sentences in your chosen spelling. Direct quotations stay exactly as the original wrote them, even if the source used American spelling. The same goes for titles in your reference list: never "correct" the spelling of a book title or a journal article title. Our guide to writing the references list covers what to copy exactly, and the free citation finder returns real sources with titles you can copy as published.
How to set Word's proofing language so the spell checker helps
Word decides which words to underline based on the proofing language attached to the text. If it is set to English (United States), Word will underline "defence" and suggest "defense", which is a common reason students change correct British spelling to American without noticing.
Microsoft Support describes the steps for desktop Word:
- Press Ctrl+A to select all the text in your document.
- Open the Review tab, select Language, then Set Proofing Language.
- Choose the English variant you want. Microsoft's page does not list which regional variants appear on your computer, so look in your own list for English (United Kingdom) or another British option.
- Click OK.
Word for the web works similarly. Microsoft says to open the Review tab, select Editor, then Set Proofing Language, choose your language and select OK.
Two details are worth knowing. First, Microsoft describes a Detect language automatically option. It is useful if you write in several languages, but it can override your choice, so if Word keeps flipping back, look at that box. Second, the same dialogue has a Do not check spelling or grammar option for selected text. That is useful for a passage you have to quote in another language, such as a Yoruba, Igbo or Hausa term, or for computer code pasted into an appendix, because those words would otherwise clutter your document with red lines.
If you paste text from a website or an old document, the pasted section may carry its own language tag, so it may still be underlined after you have set the rest. Select it again and re-apply the proofing language. Tables and text boxes are also worth selecting separately, and so are headers, footers and captions, because they sometimes keep their own tag.
Consistency: how to check the whole document
A mixed document is the most common real spelling problem in student projects, and it usually comes from a specific cause:
- Pasted text from a friend's project, a past project or an online source that uses the other convention.
- Sources you quoted whose spelling you copied into your own sentences.
- Word set to American English on a lab or cyber-café computer, which "helpfully" replaced your British spelling while you typed with autocorrect on.
- A template from a department that uses one convention while you followed another.
Before you submit, do a quick pass:
- Use Find and Replace (Ctrl+H) for "defense", "organiz", "analyz", "program " and "color". Tick "Match case" off, and read each hit instead of using "Replace All". "Program" in the sense of a piece of software is correct in both.
- Search for the American endings "-ize", "-yze", "-or" (color, behavior) and the single-l forms (labeled, modeling).
- Read your abstract and Chapter 1 aloud. Those are the parts panel members read first, and they are where mixed spelling embarrasses students the most. Our guide to the abstract of a final year project shows what those pages need to contain.
- Check headers, footers, figure captions, table titles and the table of contents, because they are easy to miss.
Spell check will not catch a valid word used in the wrong convention if the proofing language is set to the wrong variant, so setting the language first, then checking, is the reliable order.
What the "defence" actually is
Now the second half of the searcher's question. A project defence is an oral examination in which you present your final year project to your supervisor, panel or department, and answer questions on it. In Nigeria it is often held after you submit the completed report, and marks may be split among the written report, the presentation and your answers, but the weighting and the format differ between departments. The panel usually includes your supervisor and other lecturers. Some departments hold defences for seminars and SIWES reports, too.
That is why the spelling matters to the event itself. Your slides, your report cover page, your abstract and your answers are all read or heard by a panel, and a document that is careless about spelling suggests carelessness about the work. Check it alongside the evidence and presentation requirements.
If you are moving from the spelling question to preparation, these guides go further:
- What a project defence is and how to prepare walks through the format and the weeks before it.
- Common project defence questions and how to answer them helps you rehearse the questions panels tend to ask.
- Slides and delivery are a separate skill, covered in how to prepare a project defence presentation and in how to start a seminar or defence presentation.
- If your defence is for an industrial training report, see how to defend your SIWES report.
Note that some of those older article titles use the American spelling in their URLs, such as project-defense. The URL is only an address and does not change your obligation to spell correctly in your own document.
A spelling checklist before you submit
- I asked or checked which convention my supervisor and department use.
- Word's proofing language is set for the whole document, including headers, tables and captions.
- "Defence" (or "defense") is spelled the same way everywhere, including the cover page and table of contents.
- "-ise", "-yse", "-our" and "-re" forms are consistent.
- "Programme" is used for courses and plans, "program" for software.
- Quotations, titles in the reference list and official names are copied exactly as published.
- I read the abstract and Chapter 1 aloud once, looking only for spelling.
- I ran the file through the free formatting checker to confirm font, spacing and margins against my university's rules, which is a different check from spelling.
Spelling settled? Prepare for the right kind of defence
The spelling does not change the task, but your stage of work does. Choose the preparation guide that matches what you actually have to present.
| Your assessment | What you need to explain | Start here |
|---|---|---|
| SIWES / IT defence | Your placement, personal activities, tools and learning | SIWES slide plan |
| Literature-based seminar | Your question, sources, synthesis and limits | Seminar defence questions |
| Project proposal defence | Why the study is needed and how you plan to carry it out | Proposal defence preparation |
| Completed project defence | Your actual method, results, interpretation and limitations | Final project questions |
A proposal should not contain invented findings to resemble a completed project. A seminar based on published literature should not claim you collected participants' data. A SIWES presentation should distinguish observing a task from carrying it out. Getting those distinctions right matters far more than the spelling variant.
Where UniDraft fits in
A consistent spelling convention makes the document easier to review. UniDraft builds your IT/SIWES report, seminar report or final-year project as an editable Word document, using your confirmed topic and real results, your supervisor's instructions, your department's format and your university's format, applied in that order of priority. If your supervisor tells you to use a particular spelling convention, that instruction is the kind of thing you supply as a supervisor correction, and a new version is produced while earlier versions are kept. The free format guides show what formats different universities use, and the formatting checker looks at font, spacing and margins in a .docx (it does not check your spelling). UniDraft does not make your defence slides, so use the guides above for the presentation itself.
Sources
- GOV.UK Style Guide, A to Z: UK English spelling rule, "organise" and "modelling", and "defence" listed in British form.
- Dictionary.com: defence: labels "defence" as the British variant of "defense".
- Wiktionary: defence: regional usage of the noun spelling.
- Wikipedia: American and British English spelling differences: -ise/-ize, -yse, -our, -re, licence and programme.
- Wikipedia: Nigerian English: describes Nigerian English as based on British English.
- Microsoft Support: Set up or change the languages used to check spelling and grammar: Word proofing language steps.
- Microsoft Support: Check spelling and grammar in a different language: Word desktop and web steps.
