Webster's English Dictionary

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cousin

cous.in \'k*z-*n\ n [ME cosin, fr. OF, fr. L consobrinus, fr. com- + 
   sobrinus)X cousin on the mother's side, fr. soror sister 1a: a child of 
   one's uncle or aunt  1b: a relative descended from one's grandparent or 
   more remote ancestor in  a different line 1c: KINSMAN, RELATIVE  2: one 
   associated with another : EQUIVALENT  3: - used as a title by a sovereign 
   in addressing a nobleman  4: a person of a race or people ethnically or 
   culturally related or similar