The Collaborative International Dictionary
Fifthly
Fifthly \Fifth"ly\, adv. In the fifth place; as the fifth in order.
Wiktionary
fifthly
adv. In the fifth place; fifth in a row.
WordNet
fifthly
adv. in the fifth place; "fifthly, we must adhere to the rules set by the local government"
Usage examples of "fifthly".
Fifthly, there was the older problem of the rich and the poor, the Haves and Have Nots, a problem of heightened intensity since a long-living Megarich class had developed.