definitely

adverb

def·​i·​nite·​ly ˈde-fə-nit-lē 

ˈdef-nət-

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!"

Synonyms

• certainly
• surely
• sure
• clearly
• probably
• really

Examples of definitely in a Sentence

that is definitely the kind of dog we're looking to adopt

Recent Examples on the Web

There’s definitely a gap between lab-idea companies to when companies have serious momentum to be getting some pre-seed or angel funding. —Jasmin Malik Chua, Sourcing Journal, 31 Oct. 2025

Lokedi said the footwear definitely delivered during her Boston Marathon run. —Vicki M. Young, Footwear News, 31 Oct. 2025

The tasteful trio will definitely become the most reached for bottles on their spice rack. —Mark Marino, Bon Appetit Magazine, 31 Oct. 2025

Paramount is definitely clearing its deck, along with plenty of sailors jumping — and being pushed — over the side. —James Hibberd, HollywoodReporter, 31 Oct. 2025

Word History

Etymology

definite + -ly entry 2

First Known Use

1574, in the meaning defined at sense 1

Rhymes for definitely

• indefinitely

Video

How to Remember the Spelling of 'Definitely'

A definitive answer.