One’s female offspring.
"My daughter is already planning her own wedding next summer."
In plain English: A daughter is a female child of your parents.
"My daughter is starting kindergarten next month."
Usage: Use "daughter" to refer specifically to a female child born to or adopted by a parent. Do not use it for stepchildren unless they are legally adopted or you intend to specify the relationship clearly.
The word "daughter" comes from the Old English dohtor, which was borrowed into Middle English as doghter. This term traces its roots back to the Proto-Indo-European language, where it originally meant a female child.