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.