Definitions

1. noun

A female person who is a full or half sibling of another person.

“She is my sister, and we are very close.”

2. noun

A woman who is the spouse of one’s brother.

“My brother’s wife is my sister-in-law.”

3. noun

A close female friend or companion.

“She is my sister, and we’ve been friends since college.”

4. verb

To give birth to a child, especially a girl, as if to a sister.

“She sistered him 10 kids.”