aldermanate
/ˌɔldərˈmeɪnɪt, ˌɑːldərˈmeɪnɪt/Definitions
1. noun
The office or position of an alderman; a municipal council or board, especially in the United States.
“The new aldermanate was established to address local transportation issues.”
2. verb
To choose or appoint an alderman.
“The mayor aldermanated a new member to the city council.”