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 ofsister in a Sentence
Thesisters live in the convent.
Recent Examples on the WebJones’sister, Antoinette, is in attendance, and that seems like a good omen.—
Brenna Ehrlich,Rolling Stone, 29 Mar. 2025Her brothers andsistersencouraged her to persevere, and friends helped with babysitting and gas money.—Richard J. Gonzales,Fort Worth Star-Telegram, 29 Mar. 2025However, her true inspiration for beauty projects comes from her mom andsisters.—Jordan Greene,People.com, 28 Mar. 2025Last week’s Apple Loop can be read here, or this week’s edition of Loop’ssistercolumn, Android Circuit, is also available on Forbes.—Ewan Spence,Forbes.com, 28 Mar. 2025See All Example Sentences forsister
Examples are automatically compiled from online sources to show current usage.Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.Send us feedback.
Brenna Ehrlich,Rolling Stone, 29 Mar. 2025Her brothers andsistersencouraged her to persevere, and friends helped with babysitting and gas money.—Richard J. Gonzales,Fort Worth Star-Telegram, 29 Mar. 2025However, her true inspiration for beauty projects comes from her mom andsisters.—Jordan Greene,People.com, 28 Mar. 2025Last week’s Apple Loop can be read here, or this week’s edition of Loop’ssistercolumn, Android Circuit, is also available on Forbes.—Ewan Spence,Forbes.com, 28 Mar. 2025See All Example Sentences forsisterWord History
Etymology
Middle Englishsuster, sister, partly from Old Englishsweostor and partly from Old Norsesystir sister; akin to Latinsoror sister, Sanskritsvasṛ
First Known Use
before the 12th century, in the meaning defined atsense 1
Time Traveler
The first known use ofsister was before the 12th centuryPhrases Containingsister
Rhymes forsister
Browse Nearby Words
Cite this Entry
“Sister.”Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sister. Accessed 10 Apr. 2025.
Copy CitationKids Definition
sister
nounsis·terˈsis-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:nurseentry 1sense 2
sisterlyadjective or adverb
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