Definition of fourthly adverb from the Oxford Advanced Learner's Dictionary

 

fourthly

 adverb
adverb
BrE BrE//ˈfɔːθli//
 
; NAmE NAmE//ˈfɔːrθli//
 
 
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used to introduce the fourth of a list of points you want to make in a speech or piece of writing Fourthly, I should like to mention…
See the Oxford Advanced American Dictionary entry: fourthly