Stepdaughter
/ˈstepdɔːtər/
Definition 1 of 1
Pro Tip 1/3Family Dynamics
The word can imply complex family relationships which may affect the speaker's tone and context. 
I'm planning a birthday party for my stepdaughter, it's important to make her feel special.
Pro Tip 2/3Emotional Nuance
Using 'stepdaughter' can express emotional distance or closeness, depending on the speaker's relationship. 
My stepdaughter and I share a deep bond, just like a biological parent and child.
Pro Tip 3/3Cultural Sensitivity
Awareness of family structures in different cultures will help to use 'stepdaughter' appropriately. 
In my culture, my stepdaughter is regarded with the same respect as a biological daughter.