Definition of “firstly” - English Dictionary

british dictionary

“firstly” in British English

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uk /ˈfɜː us /ˈfɝː 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.

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(Definition of “firstly” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)