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.
Related Words
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
Commonly Misspelled Words, List 2
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Commonly Confused Words, List 2
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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.
“We definitely have seen more boys and young men who already have body-image concerns becoming very engaged with looksmaxxing and presenting for care after trying to do some of these behaviors,” he says.
From The Wall Street Journal • May 4, 2026
“Christian definitely, but that’s because I interacted with him primarily in that context.”
From Los Angeles Times • May 3, 2026
But he’s definitely keeping at least one eye on politics.
From Salon • May 3, 2026
"I had a lot of sun damage, but I can see that's definitely lifted."
From BBC • May 2, 2026
Doc didn’t need to bend her knees to touch the floor, but Coal definitely did.
From "Boy 2.0" by Tracey Baptiste
Definitions 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.
