sister

The word "sister" most often means a female sibling, someone who shares one or both parents with you. For many people, this is a deeply personal word tied to growing up together, family memories, arguments, support, and the kind of understanding that comes from sharing a home or a childhood. For example: "My sister and I used to walk to school together every morning."

But the word often moves beyond family. People sometimes call a very close female friend a sister when the relationship feels stronger than ordinary friendship. In this sense, the word speaks about loyalty, warmth, and trust more than biology. For example: "We are not related, but she feels like a sister to me."

"Sister" is also a title used in religious communities, especially for nuns. In that setting, it appears before a name, as in "Sister Teresa," and shows a shared life of faith, service, and community.

The word can also be used in a wider social sense for women who stand together because of a shared experience, background, or cause. Women in activist groups, support groups, or cultural communities may speak of one another as sisters to show unity and care.

In some places, "sister" is even used as a respectful or friendly way to address a woman who is not part of your family at all. Across these uses, the word keeps the same core feeling: closeness, connection, and a bond that matters.