definition of sistering by The Free Dictionary

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1. A female having the same parents as another or one parent in common with another.

2. A girl or woman who shares a common ancestry, allegiance, character, or purpose with another or others, specifically:

a. A kinswoman.

b. A woman fellow member, as of a sorority.

c. A fellow woman.

d. A close woman friend or companion.

e. A fellow African-American woman or girl.

f. A woman who advocates, fosters, or takes part in the feminist movement.

3. Informal Used as a form of address for a woman or girl.

4. Abbr. Sr. Ecclesiastical

a. A member of a religious order of women; a nun.

b. Used as a form of address for such a woman, alone or followed by the woman’s name.

5. Chiefly British A nurse, especially the head nurse in a ward.

6. One identified as female and closely related to another: “the sisters Death and Night” (Walt Whitman).

7. Architecture A beam or other structural member affixed to another as a supplementary support.


1. Related by or as if by sisterhood; closely related: sister ships; sister cities.

2. Genetics Of or being one of an identical, related, or homologous pair: sister chromatids.

tr.v. sis·tered, sis·ter·ing, sis·ters

Architecture To affix a beam or other structural member to (another) as a supplementary support.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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