This is the 264th most frequent Czech word.
určitě
Certainly; definitely; surely.
Here, 'určitě' is used to express certainty about a future event.
Určitě přijdu na tvou oslavu.
I will definitely come to your party.
In this context, 'určitě' conveys a strong belief or assumption about a past event.
Určitě jsi ho viděla u bankomatu.
You definitely saw him at the ATM.
Here, 'určitě' emphasizes disbelief or doubt about a statement.