How to use the word "definitely"
One of my friends invited me to her wedding party in two months later when I saw her the other day.
At that time, what popped out from my mouth intuitively was the phrase "Definitely I will." But I've been
wondering if it a good way to respond. What do you think? Should I say "Of course I will"?

Question

How to use the word "definitely"
One of my friends invited me to her wedding party in two months later when I saw her the other day.
At that time, what popped out from my mouth intuitively was the phrase "Definitely I will." But I've been 
wondering if it a good way to respond. What do you think? Should I say "Of course I will"?

Answer

Thank you Юлия! I'm relieved to hear that.

Answer

As too my mind you were right. You told her that you don't doubt. :)