Meaning

noun a citizen who has a legal right to vote

noun any of the German princes who were entitled to vote in the election of new emperor of the Holy Roman Empire

originFrom Middle English electour (“one with a right to vote in electing some office, elector”), borrowed from Late Latin ēlēctor (“chooser, selector; voter, elector”), from Latin ēligere (“to elect”) + -tor (suffix forming masculine agent nouns), equivalent to elect + -or. Ēligere is the present active infinitive of ēligō (“to extract, pluck or root out; (figurative) to choose, elect, pick out”),…

Etymology from Wiktionary, CC BY-SA 3.0