countergovernment

noun

coun·​ter·​gov·​ern·​ment ˌkau̇n-tər-ˈgə-vər(n)-mənt 

-və-mənt;

-ˈgə-bᵊm-ənt,

-vᵊm-

variants or counter-government

plural countergovernments or counter-governments

: a group of people that organizes as an unofficial governing authority to oppose or supplant a legitimate or generally recognized government

His investigation … has shown the existence of what he called ersatz embassies, that is, diplomatic outposts of countergovernments or governments-in-exile.

—Richard Dale

Word History

First Known Use

1818, in the meaning defined above