Definitions

1. noun

A daughter’s partner or wife, or a woman who is the partner or wife of one’s father but not one’s mother.

“She had a difficult relationship with her new stepsister.”

2. noun

A daughter or stepdaughter, especially when used to distinguish her from a biological daughter or daughter by the same mother.

“The family welcomed the new stepsister to their home.”

3. noun

A woman who is married to one’s father but not one’s mother, or the daughter of one’s father by a previous marriage.

“The family struggled to adjust to the new stepsister.”