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If you’ve ever stopped typing to wonder whether the word is definitely or definately, you’re not alone. This is one of the most common spelling mistakes in English, affecting everyone from students and professionals to native speakers. The incorrect version appears so frequently in emails, text messages, and social media that it’s easy to question which spelling is actually right.
Fortunately, the answer is simple. Once you understand where the word comes from and why the mistake happens, you’ll never have to second-guess it again.
The Short Answer
The only correct spelling is definitely.
The spelling definately is always incorrect and should never be used in formal or informal writing.
Examples:
I will definitely attend the meeting tomorrow.
She is definitely the best person for the job.
This is definitely worth trying.Incorrect examples:
I will definately call you later.
That’s definately the right answer.Whenever you need to express certainty or emphasis, definitely is the only accepted spelling.
Why Do People Write “Definately”?
The mistake is surprisingly easy to make because of pronunciation. When spoken naturally, the middle syllables of definitely are often softened, making the word sound closer to “definately” than it actually is.
Instead of relying on how the word sounds, it’s better to remember how it is built.
The word comes directly from definite, followed by the suffix -ly.
Definite + ly = Definitely
Since definite contains the letter “i”, the adverb keeps the same spelling. There has never been a correct version that uses an “a”.
Why the Error Is So Common
Several factors contribute to this spelling mistake:
The unstressed middle vowel is difficult to hear clearly.
Many English words ending in -ate make definately look believable.
Fast typing often leads people to spell the word phonetically.
Once someone repeatedly types the incorrect version, it begins to look familiar.Because of these reasons, definately remains one of the most frequently misspelled words in English.
The Origin of “Definitely”
Looking at the word’s history makes its spelling much easier to remember.
The journey begins with the Latin word definitus, meaning “determined” or “limited.”
From there, English adopted definite, meaning clear, exact, or certain.
Finally, adding -ly created the adverb definitely, meaning without doubt or certainly.
The important point is that every stage of the word’s history contains the letter “i.” There is no historical or linguistic reason for replacing it with an “a.”
Common Misspellings
Besides definately, several other incorrect spellings appear regularly.
Spelling Correct? Problem
definitely Yes Correct spelling
definately No Wrong vowel
definatly No Missing letter and wrong vowel
deffinitely No Extra “f”
difinitely No Incorrect opening vowelAlthough these versions are common, none of them are accepted in standard English.
Easy Ways to Remember the Correct Spelling
Remember the Root WordThink of the word as:
Definite + ly
If you know how to spell definite, you’ve already solved most of the problem.
Spot the Word “Finite”
A helpful trick is noticing that finite appears inside definite.
de + finite
Since finite is spelled with an “i,” the entire word follows the same pattern.
The “No A” Rule
There is no letter “a” anywhere in definitely.
If you find yourself typing an “a,” you’ve made a spelling mistake.
Repeat a Memory Sentence
Try remembering this simple sentence:
“I definitely know the definite answer.”
Seeing both words together reinforces the correct spelling.
Examples of Correct Usage
Everyday Conversation
I’m definitely going with you.
That’s definitely my favourite film.
She’s definitely telling the truth.
Professional Writing
We will definitely review your application this week.
The project will definitely improve customer satisfaction.
I can definitely help with that request.
Academic Writing
The evidence definitely supports the conclusion.
The experiment definitely produced measurable results.
This topic definitely deserves further research.
Why Correct Spelling MattersUsing the correct spelling does more than satisfy grammar rules—it improves how others perceive your writing.
Professional Communication
Misspelling common words in business emails, CVs, or reports can make your writing appear rushed or careless.
Academic Work
Teachers and professors often notice repeated spelling mistakes, which can reduce the overall quality of essays and assignments.
Online Content
Readers expect polished writing. Frequent spelling errors can reduce credibility and make articles seem less trustworthy.
Everyday Messages
Even casual texts or social media posts look more polished when common words are spelled correctly.
Tips to Avoid the Mistake
If definitely is a word you often misspell, these habits can help:
Remember definite + ly.
Look for finite inside the word.
Remind yourself there is never an “a” in definitely.
Slow down when typing frequently used words.
Use spell-check as a safety net rather than relying on it completely.
Practise writing the word until it becomes second nature.Over time, the correct spelling will become automatic.
Final Thoughts
The answer to Definitely vs Definately is clear: definitely is the only correct spelling, while definately is always incorrect.
Although the mistake is extremely common, it’s easy to avoid once you remember that the word comes from definite plus -ly. Focusing on the root word instead of the pronunciation makes the spelling much easier to remember.
Whether you’re writing an email, preparing an assignment, publishing an article, or simply sending a text, using definitely correctly helps your writing look more polished, professional, and trustworthy. Once you learn the simple rule behind it, you’ll never hesitate over Definitely vs Definately again.
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