Daughter/ˈdɔːtər/ Definition 1 of 5Pro Tip 1/2Immediate Family Use 'daughter' to refer to a female child within the immediate family circle. My daughter starts school this year. Pro Tip 2/2Avoid Assuming Age 'Daughter' doesn't imply age; adult female children are still daughters. Even at 50, she proudly introduces herself as her father's daughter.