First Known Use: before 12th century
Dictionary
sister
noun sis·ter \ˈsis-tər\
: a girl or woman who has one or both of the same parents as you
—used when talking to a woman
: a member of a religious community of women
Full Definition of SISTER
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
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Origin of SISTER
Middle English suster, sister, partly from Old English sweostor and partly from Old Norse systir sister; akin to Latin soror sister, Sanskrit svasṛ
SISTER Defined for Kids
sister
noun sis·ter \ˈsi-stər\
Definition of SISTER for Kids
1
: a female person or animal related to another person or animal by having one or both parents in common
2
: a member of a religious society of women : nun
3
: a woman related to another by a common tie or interest
— sis·ter·ly adjective
Medical Dictionary
sister
noun sis·ter \ˈsis-tər\
Medical Definition of SISTER
chiefly British : a head nurse in a hospital ward or clinic; broadly : nurse
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