Usage Note
Deuxièmement is used in structured arguments or lists to introduce the second point, analogous to 'secondly' in English. In less formal speech ensuite or puis are preferred. It pairs with premièrement (firstly) and troisièmement (thirdly).
Examples
"Deuxièmement, il faut vérifier les faits."
Natural Translation
Secondly, we must check the facts.

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