n. 同族, 同源, 同根

Cognation \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}.
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