What is the meaning of Duce?

An authoritarian leader, especially Benito Mussolini.

captain, leader, helm

an authoritarian leader

alternative form of dūc (“lead!, guide!”), second-person singular present active imperative of dūcō.

ablative singular of dux

duck (bird)

to carry, lead, take

to lead, to go

to go

to die

to withstand, handle, weather, deal with

duke

Source: wiktionary.org