• IPA: /ˈfɜɹstli/

firstly (not comparable)

1. (formal) In the first place; before anything else; first.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page vii:

     Firstly, I continue to base most species treatments on personally collected material, rather than on herbarium plants. […] Secondly, I continue to base my concepts on intensive study of a limited suite of collections, rather than superficial study of every packet that comes to hand.

• 1stly, first, first of all, first up; see also Thesaurus:firstly

• French: d'abord, premièrement, en premier lieu, primo, avant tout
• German: erstens, an erster Stelle
• Italian: dapprima, prima, in primo luogo
• Portuguese: primeiramente
• Russian: во-пе́рвых
• Spanish: primeramente