This is the 207th most frequent Croatian word.
vjerojatno
Probably.
The word 'vjerojatno' here is used adverbially to indicate the likelihood of the future event of going on an excursion, implying uncertainty but high possibility.
Vjerojatno ćemo sutra ići na izlet.
We'll probably go on an excursion tomorrow.
In this sentence, 'vjerojatno' expresses a deduction or assumption about the person's knowledge based on available information or context.
On vjerojatno zna odgovor na to pitanje.
He probably knows the answer to that question.
The usage of 'vjerojatno' in this context shows a surmise about an action someone may have taken, offering a probable explanation without definitive confirmation.