"Certainly" Natural Recordings by Native Speakers
The word "certainly" is an adverb that means "to a definite extent" or "without a doubt". It is often used to express agreement, confirmation, or emphasis, and can be used in responses to questions, such as "Yes, certainly" or "I will, certainly". It can also be used to express strong feeling or conviction, such as "I certainly disagree with that".
The word "cert" is short for "certificate", which is a document that serves as proof or evidence of something, often with a verification of skills, qualifications, or accomplishments.