Half-sister (noun)

1. A sister who shares only one parent with the speaker.
2. A female sibling with whom one shares only one parent.

Origin:

From the phrase "half sister", which means a sister who shares only one parent with the speaker.

Examples:

1. She met her half-sister for the first time at the family gathering.
2. His half-sister was the only family member he had left.
3. The half-sister was raised by her father while the speaker was raised by her mother.
4. She was close to her half-sister even though they had different mothers.
5. The half-sister had a close relationship with her father but not with her mother.