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

Sunday, December 29 The Wonderful World of Disney Presents Frozen (ABC): Fearless optimist Anna sets off on an epic journey to find her sister, Elsa, whose icy powers have trapped the kingdom of Arendelle in eternal winter. —Jessica Radloff, Glamour, 29 Dec. 2024

To mark the holiday on Wednesday, the actress shared a series of sweet photos and videos on Instagram from her celebration with her child Emme, 16, sister Lynda, 53, and niece Lucie, 16. —Gil MacIas, People.com, 28 Dec. 2024

However, its sister property, the Four Seasons Resort Lanai, is just a 20-minute drive up the road and offers a variety of family-friendly activities, including Kids For All Seasons, a complimentary program for children ages 5 to 12. —Jasmine Browley, Travel + Leisure, 28 Dec. 2024

His sister’s legs and shoulder were severely injured, and his mother’s shoulder and leg were broken. —Laura Boushnak, New York Times, 27 Dec. 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