Duchess (noun)

1. The wife or widow of a duke, or a woman who holds the rank of duke in her own right.
2. A female ruler of a duchy.

Origin:

From middle english duchesse, from old french duchesse, from duc ("duke") + -esse (feminine suffix), from latin dux ("leader").

Examples:

1. The Duchess of Cambridge was stunning in her blue gown at the royal banquet.
2. The Duchess of Devonshire was a prominent figure in 18th century society.
3. The young girl was thrilled to learn that she was to marry a duke and become a duchess.
4. The duchess was a powerful ruler, respected by all who knew her.
5. The duchess's palace was filled with priceless works of art.