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sister

SIS-tur/ˈsɪs.tɚ/SIS-tuh/ˈsɪs.tə(ɹ)/

Pluralsisters

11 meanings of sister

Practice

  1. 1
    female siblingnouncountable
    A girl or woman who has one or both of the same parents as you.

    My older sister taught me how to ride a bike.

    She has two sisters and one brother.

    UsageSay big sister or little sister, or older and younger sister.

    Similarsis

    Oppositebrother

    Note
  2. 2
    equal partnernounbefore a noun
    A thing of the same kind that is closely linked to another, like a sister city or sister company.

    Like two friends who stand side by side, with neither one the boss.

    Our town has a sister city in Japan.

    The new café is a sister shop of the bakery next door.

    Similartwin, partner, sibling

    Note
  3. 3
    kindred womannouncountable
    A woman or girl linked to others by shared gender, race, beliefs, work, or community.

    She called every woman at the march her sister.

    We may not be related, but those women are my sisters.

    Note
  4. 4
    nunnouncountable
    A woman who belongs to a religious order, often one that does active service.

    The sister taught math at the convent school.

    The sisters from the convent run a free clinic in town.

    UsageAs a title, write it with a capital: Sister Mary.

    Similarnun

    Oppositebrother

    Note

Practice

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Origin

It comes from Old English words like 'sweostor', meaning sister. The 'i' spelling came from Old Norse 'systir'.

Checked 1 Nov 2026 · 3 facts