The phrase "first woman" refers to a female who holds a position or title that has never been held by another woman before. It is often used in reference to women who have achieved significant milestones, such as being elected to high political office, becoming the first woman to hold a particular job or receive an honorary degree, or breaking barriers and stereotypes within their field. The phrase highlights the significance of these achievements and the impact that they can have on other women's lives and opportunities.