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
My sister gets exasperated with having to repeat what she tells me so many
My sister and brother-in-law are suitably awestruck.
In the latest episode of scientific gene-twisting, a horse births a foal cloned
  as her genetic twin sister.
My husband refuses to play enabler, and my sister picks up on this and resents
  him for it.
Image for Sister
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