What is what does secondly mean?

Secondly is a transition word that indicates a sequence or order of ideas. It is used to introduce the second point in a discussion or argument, after the first point has been made. It implies that what is being said is not as important as the first point, but is still relevant and worth mentioning. Secondly is one of many words and phrases used in English to help structure writing and speaking in a logical and coherent way.