Where does “Publicitar” come from?

Publicitar (Portuguese) comes from Portuguese público, from Latin pūblicus, from Old Latin poplicus, from Latin pōpulus, from Proto-Italic poplos — army.

Ancestry of “Publicitar”, step by step

Step	Language	Word	Meaning
1	Portuguese	público	public; people; audience
2	Latin	pūblicus	—
3	Old Latin	poplicus	Alternative form of publicus
4	Latin	pōpulus	—
5	Proto-Italic	poplos	army

Every word from Proto-Italic poplos →

Publicitar — Etymology, Origin & Word History | Etymology Explorer