ETYM as. aldormon, ealdorman; ealdor an elder + man. Related to Elder.
(Irregular plural: aldermen).
A member of a municipal legislative body (as a city council).
Anglo-Saxon term for the noble governor of a shire; after the Norman Conquest the office was replaced with that of sheriff. From the 19th century aldermen were the senior members of the borough or county councils in England and Wales, elected by the other councillors, until the abolition of the office 1974; the title is still used in the City of London, and for members of a municipal corporation in certain towns in the us.
An elected member of a board of officials who run New England towns.