IPA: //ˈmɑːrɡrəvaɪn//
KK: /mɑrˈɡreɪvaɪn/
A woman who is the wife or widow of a margrave, often holding a title of nobility.
The margravine attended the royal ball in a stunning gown.
Margravine → It is formed from "mark" (from Old High German *marca*, meaning border or boundary) and "gräfin" (meaning countess). The term refers to a female noble who governs a border territory, thus combining the concepts of a border and nobility.
Think of a woman who rules over a 'border' ('mark') territory, which helps you remember that a margravine is a female noble in charge of a border area.