This is the 16161st most frequent Russian word.
разумеется
Certainly; obviously; of course.
This shows agreement with what was asked in the prior sentence, used as an adverb to express certainty.
Ты придёшь на вечеринку завтра? Разумеется.
Will you come to the party tomorrow? Certainly.
The word is used to emphasize agreement or willingness in response to a situation or request.
Разумеется, я помогу вам с этим проектом.
Of course, I will help you with this project.
Here, 'разумеется' is used to express a clarification of a logical consequence that is understood.