definitely
Americanadverb
-
in a clear and definite manner; unambiguously.
-
unequivocally; positively.
- Synonyms:
- certainly, absolutely
interjection
adverb
-
in a definite manner
-
(sentence modifier) certainly
he said he was coming, definitely
Usage
What does definitely mean? Definitely is an adverb that usually means certainly or without a doubt. It also has this meaning when it’s used as a single-word response. Definitely is also sometimes used as an adverb to describe an action as clearly defined or precise. When definitely is used as a single word in response to a question or other statement, it is called an interjection or sentence substitute. When used this way, it is very similar to saying certainly or absolutely. Example: I will definitely be there tomorrow—I promise.
Synonym Usage
See clearly.
Etymology
Origin of definitely
Compare meaning
How does definitely compare to similar and commonly confused words? Explore the most common comparisons:
Explanation
Use definitely to describe something you don’t have any doubt about. If you are certain you're going to see your friend's band play, you can assure him that you'll definitely be there. The adverb definitely is used to emphasize the certainty of whatever word it modifies. If you are sure you want apple pie, you could say you definitely want it. The base word definite can also mean "a certain limit," like the definite size a shelf must have to be. You wouldn't say "the carpenter definitely cuts the wood," to describe the exactness of the work; use precisely instead. AND, yes, definitely definitely has an e before the ly!
Vocabulary lists containing definitely
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Those were definitely books I didn’t read reviews of,” says James.
From The Wall Street Journal ● Oct. 22, 2026
“I felt so proud of the team, and definitely a mix of joy but also relief that it was over and we did it successfully.”
From Los Angeles Times ● Oct. 21, 2026
I received plenty of creative responses that actually seem doable — and I’ll definitely be trying the grocery one.
From MarketWatch ● Oct. 20, 2026
And with Mercedes being full - and wanting to cut their supplies to two customers rather than three for the next engine regulations - Red Bull would definitely be an option.
From BBC ● Oct. 20, 2026
There was definitely writing there—but so tiny I had to climb again onto the cot and hold the paper close to the shaded bulb.
From "The Hiding Place" by Corrie ten Boom
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
