Primarily
'primarily' is the definition.
(I know that primarily can be written as chiefly)
This is all the clue.
(Other definitions for chiefly that I've seen before include "For the most part" , "In the main" , "Mainly, principally" .)
'primarily' is the definition.
(thesaurus)
This is all the clue.
'primarily' is the definition.
(I've seen this before)
This is all the clue.
(Another definition for firstly that I've seen is " Primarily".)
'primarily' is the definition.
(I know that primarily can be written as mainly)
This is all the clue.
(Other definitions for mainly that I've seen before include "Chiefly, principally" , "For the most part" , "Generally or largely" , "Chiefly, largely" .)