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.
© Webster 1913.