/ ˈdefɪnətli; NAmE / adverb
1.
( informal ) a way of emphasizing that sth is true and that there is no doubt about it :
I definitely remember sending the letter.
'Was it what you expected?' 'Yes, definitely.'
'Do you plan to have children?' 'Definitely not!'
Some old people want help; others most definitely do not.
2.
in a way that is certain or that shows that you are certain :
The date of the move has not been definitely decided yet (= it may change) .
Please say definitely whether you will be coming or not.