alderman

Concise Oxford English Dictionary © 2008 Oxford University Press:
alderman/ˈɔːldəmən/

▶noun (pl. aldermen)

• 1 chiefly historical a co-opted member of an English county or borough council, next in status to the Mayor.

• 2 (also alderwoman) N. Amer. & Austral. an elected member of a city council.

– derivatives
aldermanic adjective,
aldermanship noun.

– origin OE aldormann (in the sense ‘a man of high rank’), from aldor, ealdor ‘chief, patriarch’ (from ald ‘old’) + man.