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English definition of “firstly”

firstly

adverb uk   /ˈfɜːst.li/ us    /ˈfɝːst-/ (also first)
B2 used to refer to the first thing in a list: There are two very good reasons why we can't do it. Firstly, we don't have enough money, and secondly, we don't have enough time.
(Definition of firstly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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