definitely

adverb

def·​i·​nite·​ly ˈde-fə-nit-lē How to pronounce definitely (audio)
ˈdef-nət-
Synonyms of definitely
1
: in a definite way : in a way free of all ambiguity, uncertainty, or obscurity
I will definitely be there.
He's very smart and very funny and is definitely a practical actor. He comes to work to get his job done and to make the best movie possible …Anna Kendrick
Omaha is definitely not hip; green-haired XML programmers do not glide past gourmet coffee emporiums on Razor scooters.Adam Rogers
2
a
used in speech as a forceful way of expressing agreement or saying "yes"
"Do you think they'll win?" "Definitely!"
b
used in speech in the phrase definitely not as a forceful way of expressing disagreement or saying "no"
"Do you agree with him?" "Definitely not!"

Examples of definitely in a Sentence

that is definitely the kind of dog we're looking to adopt
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The Venn diagram of these elements definitely overlap on many theme park attractions. Robert Niles, Oc Register, 26 May 2026 Mount Morrison is definitely not a casual hike, but casual hikes aren’t the best training for fourteeners. John Meyer, Denver Post, 26 May 2026 Strategy consulting definitely has room for nerds. Christian Stadler, Forbes.com, 26 May 2026 But looking at it in May, there's definitely a real difference. Ian Miller Outkick, FOXNews.com, 25 May 2026 See All Example Sentences for definitely

Word History

Etymology

definite + -ly entry 2

First Known Use

1574, in the meaning defined at sense 1

Time Traveler
The first known use of definitely was in 1574

Cite this Entry

“Definitely.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/definitely. Accessed 27 May. 2026.

More from Merriam-Webster on definitely

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster