\Cog*na"tion\, n. [L. cognatio.]
1. Relationship by blood; descent from the same original;
   kindred.
         As by our cognation to the body of the first Adam.
                                               --Jer. Taylor.
2. Participation of the same nature. --Sir T. Browne.
         A like temper and cognation.          --Sir K.
                                               Digby.
3. (Law) That tie of consanguinity which exists between
   persons descended from the same mother; -- used in
   distinction from {agnation}.