young lady

a young, usually unmarried woman of refinement, grace, etc.

any young woman.

a girlfriend; sweetheart; fiancée.

Origin of young lady

late Middle English word dating back to 1375–1425

A young-lady apprentice would be quite an attractive feature.

Lippincott's Magazine of Popular Literature and Science, Vol. 26, October, 1880 |Various
I was like a young-lady comet drawing after me a luminous trail of love.

The Jessica Letters: An Editor's Romance |Paul Elmer More
Since the catastrophe recorded in the last chapter, Mrs. Tibbs had been very shy of young-lady boarders.

Sketches by Boz |Charles Dickens
There were no pleasant games of snapdragon, or touch, nor even a gossip over the tea table for the young-lady foxes.

Hans Andersen's Fairy Tales |Hans Christian Andersen

Beatrix was in a young-lady reverie, and did not observe what was going on.

Guy Deverell, v. 1 of 2 |Joseph Sheridan Le Fanu

young lady

a girlfriend; sweetheart