sister

noun

sis·​ter ˈsi-stər 

1

: a female who has one or both parents in common with another

2

often capitalized

a

: a member of a women's religious order (as of nuns or deaconesses)

especially : one of a Roman Catholic congregation under simple vows

b

: a girl or woman who is a member of a Christian church

3

a

: a girl or woman regarded as a comrade

b

: a girl or woman who shares with another a common national or racial origin

especially : a Black girl or woman

4

: one that is closely similar to or associated with another

sister cities

5

chiefly British : nurse

6

a

: girl, woman

b

: person

—usually used in the phrase weak sister

7

: a member of a sorority

Examples of sister in a Sentence

The sisters live in the convent.

Recent Examples on the Web

The two Kardashian sisters have had a busy summer so far. —Charlotte Phillipp, Peoplemag, 22 July 2024

Drag Race star Kennedy Davenport reveals partner had miscarriage: 'Thank you all for the love' Morphine's season 16 sisters celebrated their fellow queen's safety online, with Miss Congeniality winner Xunami Muse sharing a message of encouragement to social media. —EW.com, 22 July 2024

What started with just two sisters now includes their father, brother, a husband and three more employees. —Louisa Kung Liu Chu, Chicago Tribune, 22 July 2024

During an era in which girls and women’s soccer was largely an afterthought in the U.K., when many dads would rather their daughters join them in the stands for a men’s professional game than play themselves, Sid encouraged Emma and her two sisters to pursue the sport. —Sean Gregory, TIME, 22 July 2024

Word History

Etymology

Middle English suster, sister, partly from Old English sweostor and partly from Old Norse systir sister; akin to Latin soror sister, Sanskrit svasṛ

First Known Use

before the 12th century, in the meaning defined at sense 1

Phrases Containing sister

• big sister
• brother/sister/comrade in arms
• foster brother/sister
• half sister
• little brother/sister
• sister chromatid
• sister city
• sister-in-law
• sob sister
• soul sister
• weak sister

Kids Definition

sister

noun

sis·​ter ˈsis-tər 

1

: a female who has one or both parents in common with another individual

2

often capitalized : a member of a religious community of women : nun

3

a

: a fellow female member of a group

b

: a girl or woman who shares a common national or racial origin with another

4

: one that is closely similar to or associated with another

sister schools

sister ships

5

chiefly British : nurse entry 1 sense 2

sisterly adjective or adverb

Medical Definition

sister

noun

sis·​ter ˈsis-tər 

chiefly British

: a head nurse in a hospital ward or clinic

broadly : nurse