Your sister is your female sibling. ... If you join a college sorority or a trade union, you'll refer to the other members as your sisters. Catholic nuns and other religious women are also called sisters. The roots of sister go back to words meaning "one's own" and "woman."

What does it mean to call someone your sister?

While the term implies a closeness that "friend zone" does not, it can often mean that there's even less of a chance of a relationship there. For one, calling someone a sister is shorthand for saying you're not interested in them romantically.

What does dear sister mean?

1 beloved; precious. 2 used in conventional forms of address preceding a title or name, as in Dear Sir or my dear Mr Smith. 3 postpositive; foll by: to important; close.