This is definitely, 'The good you do for others is good you do yourself'! It's a reward because I was helpful!
The horse and buggy is now definitely out of date.
He's definitely the right guy for the job. Let him fiddle with a computer and he perks right up.
Definitely!
Cost is a definite factor in making our decision.
There is a definite time to return the book.
We definitely heard that sound.
You should definitely ask him out.
Your idea is definitely worth thinking about.
I want you to have a definite plan before you leave.
It is definite that he will go.
It will be four years before the definite result of beef liberalization emerges.
In the absence of definite evidence, he was acquitted.
Give me a definite answer.
A scientist had to know how to ask the correct question and to state it so clearly that the answer would be, in effect, a definite yes or no, not "maybe".