definitely
I will definitely finish my homework tonight.
The speaker is certain they will complete their homework.
without any doubt; certainly
She is definitely coming to the party.
There is no doubt she will attend.
This is definitely the best movie I've ever seen.
The speaker is certain of their opinion.
Used to express strong agreement or certainty. Often replaces 'yes' in responses.
Collocations
Pro Tip
Avoid redundancy
Do not pair 'definitely' with other certainty words like 'absolutely' or 'certainly' in the same sentence (e.g., 'I am definitely absolutely sure' is redundant).
Gold Rule
Use for emphasis
Use 'definitely' to strongly affirm or agree. It is more emphatic than 'probably' or 'maybe'.
Word Origin
From Latin *definitus* (defined, precise), past participle of *definire* (to limit, define), from *de-* (completely) + *finire* (to end, limit). Entered English in the late 16th century with the sense of 'clearly defined' before acquiring its modern adverbial use.
Usage Notes
Common in spoken and written English. Often used in informal contexts to emphasize agreement or certainty. Avoid overusing in formal writing where 'certainly' or 'undoubtedly' may be preferred.