1
: a female who has one or both parents in common with another
2
often Sister
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
Her sister, Annie Guthrie, didn’t wander far either.
—
Amanda Musa, CNN Money, 4 Feb. 2026
Luke Ganger said their family had taken some consolation in the thought that his sister’s death might spark a change.
—Andrea Castillo, Los Angeles Times, 3 Feb. 2026
In Season 1, middle sister, seventeen-year-old Adriana (Madelyn Keys) trains for the World Championships with new partner Brayden (Cale Ambrozic), while still harbouring feelings for her first love and former partner, Freddie (Olly Atkins).
—Denise Petski, Deadline, 3 Feb. 2026
My other sister lives in Los Angeles, married a TV producer, and just wants to sell the home immediately.
—Christopher A. Combs, AZCentral.com, 3 Feb. 2026
See All Example Sentences for sister
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Amanda Musa, CNN Money, 4 Feb. 2026
Luke Ganger said their family had taken some consolation in the thought that his sister’s death might spark a change.
—Andrea Castillo, Los Angeles Times, 3 Feb. 2026
In Season 1, middle sister, seventeen-year-old Adriana (Madelyn Keys) trains for the World Championships with new partner Brayden (Cale Ambrozic), while still harbouring feelings for her first love and former partner, Freddie (Olly Atkins).
—Denise Petski, Deadline, 3 Feb. 2026
My other sister lives in Los Angeles, married a TV producer, and just wants to sell the home immediately.
—Christopher A. Combs, AZCentral.com, 3 Feb. 2026
See All Example Sentences for sister
Cite this Entry
“Sister.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sister. Accessed 4 Feb. 2026.
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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