mayor noun may· or ˈmā-ər ˈme (-)ər : an official elected to act as head of a city or borough mayoral ˈmā-ə-rəl ˈme- ə- adjective Legal Definition mayor noun may· or ˈmā-ər, ˈmer : an official elected or appointed to act as chief executive or nominal head of a city, town, or borough More from Merriam-Webster on mayor