This is the 1442nd most frequent Polish word.
zapewne
"Zapewne" means "probably" or "certainly."
"Zapewne" is used here to express a probability or assumption about the speaker's plans.
Zapewne pojadę do kina dzisiaj.
I'll probably go to the cinema today.
In this sentence, "zapewne" is used to convey an expectation or educated guess about an outcome.
Zapewne będą mieli odpowiedź na nasze pytania.
They probably will have an answer to our questions.
Here, "zapewne" is applied for certainty or strong belief about the given opinion.