sister
n. countable A1 Beginner Oxford US //ˈsɪstɝ// UK //sˈɪstɐ// sis·ter
n. a girl or woman who has the same parents as you. You can also use this word for a close female friend who feels like family.
n. a female sibling; a woman or girl in relation to other children of her parents. Also used as a term of address for a female member of a religious order or a close female associate.
My older sister helps me with my homework.
She lives in London with her younger sister while they both attend university.
The bond between a sister and her siblings often serves as a primary social foundation, influencing interpersonal dynamics well into adulthood.
Usage
Commonly used as a term of address in informal contexts among women to express solidarity.