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
The 26-year-old sister of NHL player Johnny Gaudreau and AHL player Matthew Gaudreau married her high school sweetheart Devin Joyce in Philadelphia on Friday, July 11, the couple announced in an Instagram post.
—
Miami Herald, 14 July 2025
Lawsuits between Erin Spohr and her sister, Adrienne Spohr, allege money played a role in the June 2021 deadly shooting.
—Rosalio Ahumada, Sacbee.com, 14 July 2025
The victims were connected to the shooter — Combs is the sister of the mother of House’s children, and Gumm is their mother.
—Sean Neumann, People.com, 14 July 2025
Luna Lunardi, 2, of Libertyville, sat on the shoulders of her father Steven near Luna’s sister Collins Jo, 4, and the children’s mother Margaret.
—Karie Angell Luc, Chicago Tribune, 14 July 2025
See All Example Sentences for sister
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Miami Herald, 14 July 2025
Lawsuits between Erin Spohr and her sister, Adrienne Spohr, allege money played a role in the June 2021 deadly shooting.
—Rosalio Ahumada, Sacbee.com, 14 July 2025
The victims were connected to the shooter — Combs is the sister of the mother of House’s children, and Gumm is their mother.
—Sean Neumann, People.com, 14 July 2025
Luna Lunardi, 2, of Libertyville, sat on the shoulders of her father Steven near Luna’s sister Collins Jo, 4, and the children’s mother Margaret.
—Karie Angell Luc, Chicago Tribune, 14 July 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 19 Jul. 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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