agnation

noun

consanguinity by a line of males only, as distinguished from cognation / (grammar) The property of being agnate.

The concept of agnation is based on the idea of consanguinity through a line of males only.

意味（1）

consanguinity by a line of males only, as distinguished from cognation

Between an uncle and his sister's son, therefore, there is no agnation, but only kinship

意味（2）

(grammar) The property of being agnate.