Is “Firstly” a Scrabble word?
Yes
FIRSTLY
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Firstly
/ˈfɜɹstli/
adverb
1.In the first place; before anything else; first.
Synonyms: 1stly, first, first of all, first up