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
7
: a member of a sorority
Examples of sister in a Sentence
The sisters live in the convent.
Recent Examples on the Web
Brandy’s decision was influenced by the histories of her sisters, including older sister Wren, who was diagnosed with triple-negative breast cancer despite not carrying the BRCA gene.
—
Ashley Vega, People.com, 5 Mar. 2025
Sandra, who is revealed to be Jacek’s sister, and whose existence Greta was not even aware of, orchestrated their falling-out.
—Isabella Wandermurem, TIME, 5 Mar. 2025
That came a day after his younger sister, Je’Nyia, won the women’s 400-meter championship in a time of 51.82 seconds for Pittsburgh in the Athletic Coast Conference indoor track and field meet.
—Buddy Collings, Orlando Sentinel, 5 Mar. 2025
In her last three appearances, the second lady was wearing pieces from Favorite Daughter, a brand owned by sisters Sara and Erin Foster, daughters of record producer David Foster.
—Wwd Staff, WWD, 5 Mar. 2025
See All Example Sentences for sister
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Ashley Vega, People.com, 5 Mar. 2025
Sandra, who is revealed to be Jacek’s sister, and whose existence Greta was not even aware of, orchestrated their falling-out.
—Isabella Wandermurem, TIME, 5 Mar. 2025
That came a day after his younger sister, Je’Nyia, won the women’s 400-meter championship in a time of 51.82 seconds for Pittsburgh in the Athletic Coast Conference indoor track and field meet.
—Buddy Collings, Orlando Sentinel, 5 Mar. 2025
In her last three appearances, the second lady was wearing pieces from Favorite Daughter, a brand owned by sisters Sara and Erin Foster, daughters of record producer David Foster.
—Wwd Staff, WWD, 5 Mar. 2025
See All Example Sentences for sister
Cite this Entry
“Sister.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sister. Accessed 15 Mar. 2025.
Copy CitationKids 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
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