[noun] [C], [adjective] [not gradable] [formal or dated] - (a person or thing that is) equal in rank, ability or power to another person or thingShe believed that no person, no matter how great, should regard themselves as superior to the state, or even coequal.
COEQUAL
Meaning of COEQUAL in English
Cambridge English vocab. Кембриджский английский словарь. 2012