Definition of fifthly adverb from the Oxford Advanced American Dictionary

 

fifthly

 adverb
adverb
NAmE//ˈfɪfθli//
 
 
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used to introduce the fifth of a list of points you want to make in a speech or piece of writing Fifthly, we need to consider the effect on the local population.
See the Oxford Advanced Learner's Dictionary entry: fifthly