Certainly

What is Certainly ?

Certainly is (adv) 1. of course (after a question or order.) Can you give me a lift to the station? – Certainly. Tell him to write to me immediately. – Certainly, sir. Give me a kiss. – Certainly not! 2. definitely She certainly impressed the judges. He certainly knows how to score goals.

 

source: Easier English, Student Dictionary Upper Intermediate Level