Definition of secondly adverb from the Oxford Advanced American Dictionary

 

secondly

 adverb
adverb
NAmE//ˈsɛkəndli//
 
 
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used to introduce the second of a list of points you want to make in a speech or piece of writing Firstly, it's expensive, and secondly, it's too slow.
See the Oxford Advanced Learner's Dictionary entry: secondly