I looked up the word “millenary” and the adjective definition is “suggesting a millennium” or “relating to a group of 1000.” In context, this character is describing her father’s beliefs in the early 1930s. I’m struggling to understand how this word fits here. Does it mean that there are a thousand ways men rule over women? Is it describing the father’s belief that this related to some millennium of subjection?

It promised independence but was another knot in the millenary subjection of women to the rule of men.

From Trust by Hernan Diaz