IPA: /ˈfɔːrθli/
KK: /ˈfɔrθli/
In the fourth position or order; used to indicate the fourth item in a list or sequence.
First, we need to gather the materials; second, we will prepare the workspace; third, we will start the project, and fourthly, we will review our progress.
Fourthly → It is formed from "fourth" (from Old English "fēorða", meaning the ordinal number four) and the suffix "-ly" (meaning in a manner of). The word "fourthly" means in the manner of the fourth item or point.
Think of the word 'fourth' as indicating the position of something in a sequence, and remember that 'fourthly' means to describe something in the manner of that fourth position.