“definately” is a common English spelling error.
The standard spelling is “definitely.”
Example
[Verse]
I will definately stay[Verse]
I will definitely stayThe fix
In the workbench this finding carries one control, labelled Replace with definitely. The change is contextual, so it is previewed as a diff in your document first and applies only when you confirm it.
Sources
The guidelines this rule enforces, as cited on every finding it reports:
Commonly Misspelled Words verified Frequent English misspellings including definitely and tomorrow
More Commonly Misspelled Words verified Frequent English misspellings including separate and achieve
Spelling: Top 50 spelling mistakes in English verified High-frequency learner misspellings including definately, freind, untill and recieve