Definition of firstly adverb from the Oxford Advanced American Dictionary

 

firstly

 adverb
adverb
NAmE//ˈfərstli//
 
 
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used to introduce the first of a list of points you want to make in a speech or piece of writing There are two reasons for this decision: firstly… Which Word?first (of all) / firstly / at first First (of all) and firstly are used to introduce a series of facts, reasons, opinions, etc:The brochure is divided into two sections, dealing first of all/firstly with basic courses and second/secondly with advanced ones.First (of all) is more common than firstly. At first is used to talk about the situation at the beginning of a period of time, especially when you are comparing it with a different situation at a later period:Maggie had seen him nearly every day at first. Now she saw him much less often. Language Bankfirstordering your points This study has the following aims:first, to investigate how international students in America use humor;second, to examine how jokes can help to establish social relationships; and, third, to explore the role that humor plays in helping overseas students adjust to life in the U.S. Let us begin by identifying some of the popular joke genres in the U.S. Next, let us turn to/Next, let us consider the question of gender differences in the use of humor. Finally/Lastly, let us briefly examine the role of humor in defining a nation's culture.
See the Oxford Advanced Learner's Dictionary entry: firstly