In short and simple terms, "mademoiselle" is a French word used to politely address a young, unmarried woman.
Sentences with «mademoiselle»
You totally deserve all the very best as always Mademoiselle Jessi! (jmalay.com)
CHANEL COCO MADEMOISELLE BODY LOTION — My mum had gotten the Chanel Coco Mademoiselle perfume set as a gift for her birthday last year. (touchofgs.com)