If you've ever stopped while typing and wondered whether it should be definitely or definately, you're far from alone. This is one of the most common spelling mistakes in English, appearing everywhere from text messages and social media posts to business emails and academic papers.



The confusion is understandable. The two words sound almost identical when spoken, making it easy to rely on pronunciation instead of spelling. Fortunately, the answer is simple, and once you understand where the word comes from, you'll never have to second-guess it again.



The Short Answer



The only correct spelling is definitely.



Definately is a misspelling and is not accepted in standard English.



Correct Examples:



I will definitely attend the meeting.

She is definitely the best person for the job.

We are definitely making progress.



Incorrect Examples:



I will definately attend the meeting.

She is definately the best person for the job.

Quick Comparison

Spelling Correct? Explanation

Definitely Yes The only correct spelling.

Definately No Incorrect middle vowel.

Definatly No Misspelled and missing a letter.

Difinitely No Incorrect first vowel.

Deffinitely No Unnecessary extra consonant.

Why Do People Write "Definately"?



The mistake usually happens because English pronunciation doesn't always match spelling.



When people say definitely quickly, the middle syllable becomes unstressed and sounds more like "uh." As a result, many writers instinctively replace the i with an a, creating the incorrect spelling definately.



Another reason is that many English words ending in -ate follow a familiar spelling pattern, causing people to assume this word does too. Unfortunately, definitely doesn't follow that pattern.



Common reasons for the error include:



Writing based on pronunciation rather than spelling.

Confusing it with words that end in -ate.

Typing too quickly.

Repeating a spelling mistake until it starts to look correct.

Relying too heavily on autocorrect.

Where Does "Definitely" Come From?



Understanding the word's history makes the spelling much easier to remember.



The word definitely comes directly from definite, which ultimately traces back to the Latin word definitus, meaning "fixed," "determined," or "clearly defined."



The adverb is simply formed by adding -ly to definite:



definite + ly = definitely



Notice that definite contains the letter i, not a. Since the root word never changes, neither does its adverb form.



This is why definately has no historical or grammatical basis.



Easy Ways to Remember the Correct Spelling

1. Think of the Root Word



If you can spell definite, you already know how to spell definitely.



Simply add -ly.



definite → definitely



2. Spot the Word "Finite"



One of the easiest memory tricks is noticing that finite appears inside definite.



Since finite always uses an i, definitely does too.



3. Remember There's No "A"



A simple rule is:



There is no letter "a" anywhere in definitely.



If you see an a, you've found a spelling mistake.



4. Say It in Parts



Break the word into smaller pieces:



de • fin • ite • ly



Hearing each syllable separately helps reinforce the correct spelling.



Examples in Everyday Writing

Professional

I will definitely send the report this afternoon.

This is definitely our strongest proposal.

We should definitely schedule another meeting.

Academic

The findings definitely support the original hypothesis.

This topic definitely deserves further research.

The evidence definitely points toward the same conclusion.

Casual Conversation

I'm definitely coming tonight.

That's definitely my favourite restaurant.

You'll definitely enjoy the film.

Incorrect Usage



Avoid writing:



I'll definately be there.

She's definately right.

We will definatly finish today.

Why Correct Spelling Matters



Although definately is a small mistake, it can affect how your writing is perceived.



Professional Communication



Misspelling a common word in emails, CVs, or reports may give the impression that the document wasn't carefully reviewed.



Academic Writing



Teachers and examiners often notice repeated spelling mistakes, especially when they involve everyday vocabulary.



Online Content



Blog posts, articles, and websites with obvious spelling errors appear less trustworthy and less polished to readers.



Personal Credibility



Accurate spelling shows attention to detail and helps your message appear more professional and reliable.



Tips to Stop Making This Mistake



If this word regularly catches you out, try these habits:



Remember definite + ly.

Look for the hidden word finite.

Remind yourself that definitely never contains the letter a.

Slow down when typing important documents.

Use spell-check as a final review rather than your only safety net.

Practise writing the word several times until it becomes second nature.

Frequently Asked Questions

Is "definately" ever correct?



No. Definately is always a spelling mistake.



Why is "definitely" so difficult to spell?



Because its pronunciation doesn't clearly reflect its spelling. The unstressed middle vowel often sounds like "uh," making many people choose the wrong vowel.



Does spell-check always catch "definately"?



Modern spell-checkers usually do, but not every writing app catches every mistake. It's still worth knowing the correct spelling yourself.



Is "definitely" an adverb?



Yes. It modifies verbs, adjectives, or entire sentences to express certainty or emphasis.



Final Thoughts



The debate over Definitely vs Definately has a simple answer: definitely is the only correct spelling, while definately is always incorrect.



The easiest way to remember it is to focus on the root word definite. Since definite is spelled with an i, adding -ly gives you definitely—never definately.



Once you connect the spelling to its origin instead of its pronunciation, you'll find yourself writing it correctly every time. Whether you're sending a professional email, writing an assignment, or publishing online, getting this one word right helps your writing appear clearer, more polished, and more credible.