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 concerned sister added that the family would keep looking.
—
Kelsey Lentz, PEOPLE, 29 Oct. 2025
Apa's character, Archie Andrews, was attacked by a bear after escaping from an underground prison fight club; Reinhart's Betty discovered her father was a serial killer and saved her sister from a cult; and Mendes traveled back in time to invent birth control.
—Ryan Coleman, Entertainment Weekly, 29 Oct. 2025
Instead, reporters found Moore and her sisters, Nation of Islam members, and a handful of activists representing smaller Black Nationalist groups.
—Literary Hub, 28 Oct. 2025
Programming for couples, groups and multigenerational families also includes sister property Black Bear at Alpine Falls Ranch, with lodging options from luxury glamping tents to six-bedroom mountain villas with fireplaces and private-chef dining.
—Suzanne Wright, USA Today, 28 Oct. 2025
See All Example Sentences for sister
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Kelsey Lentz, PEOPLE, 29 Oct. 2025
Apa's character, Archie Andrews, was attacked by a bear after escaping from an underground prison fight club; Reinhart's Betty discovered her father was a serial killer and saved her sister from a cult; and Mendes traveled back in time to invent birth control.
—Ryan Coleman, Entertainment Weekly, 29 Oct. 2025
Instead, reporters found Moore and her sisters, Nation of Islam members, and a handful of activists representing smaller Black Nationalist groups.
—Literary Hub, 28 Oct. 2025
Programming for couples, groups and multigenerational families also includes sister property Black Bear at Alpine Falls Ranch, with lodging options from luxury glamping tents to six-bedroom mountain villas with fireplaces and private-chef dining.
—Suzanne Wright, USA Today, 28 Oct. 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 29 Oct. 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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