1. (personal noun) Pleiades, Seven Sisters - an open cluster of many stars in the constellation Taurus, with at least six stars visible to the naked eye. First appearance before sunrise of Matariki in the north-eastern sky indicates the beginning of the Māori year - about the middle of June. According to some tribes, Matariki is the star of the old year and Puanga-rua the star of the new year.