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sister

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noun [countable] sister pronunciation in British English /ˈsɪstə(r)/ 
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singularsister
pluralsisters
  1. 1
    a daughter of your parents. A son of your parents is called your brother

    He has two brothers and two sisters.

    big/little sister (=an older or younger sister):

    She has to babysit for her little sister tonight.

    See also  half sister, stepsister

protologism

a new word or phrase invented in the hope that it will become generally used

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