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.