Definition from Wiktionary, the free dictionary
cogovernor (plural cogovernors)
- Someone who governs something together with someone else
1988 June 17, Harold Henderson, “Big Ideas”, Chicago Reader:
- Students […] are cogovernors in the Assembly of Shimer College (which sets policy under the board of trustees and is constituted as "a participatory democracy"), and cosustainers of the college's day-to-day operations.