GNU Collaborative International Dictionary of English

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Found one definition

1.       
   matriarch (?), n. [L. mater mother + -arch.]
   1. The mother and ruler of a family or of her descendants; a ruler by maternal right.
   
   [1913 Webster]
   
   
   2. A woman who dominates or is the most important member of a group or organization; in businesses, often the founder or owner of the largest interest.
   
   [PJC]
   
   
   3. A venerated old woman.
   
   [PJC]