IPA: /ˈeɪθli/
KK: /ˈeɪθli/
In the position that is eighth in a sequence or list.
She finished eighthly in the race, just behind her teammate.
Eighthly → It is formed from "eighth" (from Old English "eahta", meaning the number eight) and "-ly" (meaning in a manner of). The word "eighthly" means in the manner of the eighth item or position.
Think of the word 'eighth' which refers to the number eight, and remember that 'eighthly' means in the manner of the eighth.