Cosinage \Cos"in*age\ (k?s"'n-?j), n. [See {Cousinage}.] (Law)
(a) Collateral relationship or kindred by blood;
consanguinity. --Burrill.
(b) A writ to recover possession of an estate in lands, when
a stranger has entered, after the death of the
grandfather's grandfather, or other distant collateral
relation. --Blackstone.
[1913 Webster]