a female offspring having both parents in common with another offspring; female sibling.
Also called half sister. a female offspring having only one parent in common with another offspring.
a female friend or protector regarded as a sister.
a thing regarded as feminine and associated as if by kinship with something else: The ships are sisters.
a female fellow member, as of a church.
a female member of a religious community that observes the simple vows of poverty, chastity, and obedience.
British. a nurse in charge of a hospital ward; head nurse.
a fellow black woman.
a woman who supports, promotes, or participates in feminism.
Informal. a form of address used to a woman or girl, especially jocularly or contemptuously: Listen, sister, you've had enough.
being or considered a sister; related by or as if by sisterhood: sister ships.
having a close relationship with another because of shared interests, problems, or the like: We correspond with school children in our sister city.
Biochemistry. being one of an identical pair.

before 900; Middle English (noun) < Old Norse systir; cognate with Old English sweoster, Dutch zuster, German Schwester, Gothic swistar; akin to Serbo-Croatian sèstra, Lithuanian sesuõ, Latin soror (< *swesor), Old Irish siur, Welsh chwaer, Sanskrit svasar sister, Greek éor daughter, niece

sisterless, adjective
sisterlike, adjective
nonsister, noun, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sister (ˈsɪstə)
1.  a female person having the same parents as another person
2.  half-sister See stepsister
3.  a female person who belongs to the same group, trade union, etc, as another or others
4.  informal a form of address to a woman or girl, used esp by Black people in the US
5.  a senior nurse
6.  chiefly RC Church a nun or a title given to a nun
7.  a woman fellow member of a Church or religious body
8.  (modifier) belonging to the same class, fleet, etc, as another or others: a sister ship
9.  (modifier) biology denoting any of the cells or cell components formed by division of a parent cell or cell component: sister nuclei
[Old English sweostor; related to Old Norse systir, Old High German swester, Gothic swistar]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. sweostor, swuster, or a Scand. cognate (cf. O.N. systir, Swed. sister, Dan. søster), in either case from P.Gmc. *swestr- (cf. O.S. swestar, O.Fris. swester, M.Du. suster, Du. zuster, O.H.G. swester, Ger. Schwester, Goth. swistar), from PIE *swesor, one of the most persistent and unchanging
PIE root words, recognizable in almost every modern I.E. language (cf. Skt. svasar-, Avestan shanhar-, L. soror, O.C.S., Rus. sestra, Lith. sesuo, O.Ir. siur, Welsh chwaer, Gk. eor). Probably from PIE roots *swe- "one's own" + *ser- "woman." For vowel evolution, see bury. Used of nuns in O.E.; of a woman in general from 1906; of a black woman from 1926; and in the sense of "fellow feminist" from 1912.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for sisters
She cut off the heads of all three cows, who were her sisters.
He had two younger sisters named anna maria and maria magdalena.
The case involved two sisters who settled a deceased estate via mediation.
The two sisters are reluctant to go inside the house where their stepmother
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