twinships

/ˈtwɪnˌʃɪps/
noun
  1. Plural of twinship; multiple instances of the state or condition of being twins or closely connected.
    • The conference explored the twinships between various sister cities around the world.
    • The study examined the twinships of identical and fraternal twins raised apart.
    • In mythology, there are several famous twinships, such as Castor and Pollux.
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