What is the female equivalent of brethren?

There isn't a single, universally accepted female equivalent of "brethren." Here are a few options and their nuances:

* Sisters: This is the most common and straightforward equivalent, emphasizing the shared bond and community of women.

* Sisterhood: This emphasizes the collective unity and shared experiences of women.

* Fellow women: This is a more formal and inclusive term, emphasizing shared gender identity.

* Women of faith: This is specifically used in religious contexts, referring to female members of a church or community.

* Ladies: This is a more traditional and often outdated term that can feel patronizing.

* Womankind: This is a broad term encompassing all women, often used in a general sense.

The best choice will depend on the specific context and the desired tone. For example, "sisters" might be used in a religious setting, while "fellow women" could be used in a more formal, secular setting.