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The Collaborative International Dictionary
Cosinage

Cosinage \Cos"in*age\ (k?s"'n-?j), n. [See Cousinage.] (Law)

  1. Collateral relationship or kindred by blood; consanguinity.
    --Burrill.

  2. 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.

Wiktionary
cosinage

n. 1 collateral relationship or kindred by blood; consanguinity. 2 (context legal English) 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.