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The Collaborative International Dictionary
Arrentation

Arrentation \Ar`ren*ta"tion\ [Cf. F. arrenter to give or take as rent. See Arendator.] (O. Eng. Law) A letting or renting, esp. a license to inclose land in a forest with a low hedge and a ditch, under a yearly rent.

Wiktionary
arrentation

n. (context legal UK obsolete English) A letting or renting, especially a licence to enclose land in a forest with a low hedge and ditch, under a yearly rent.

Wikipedia
Arrentation

Arrentation ( Lat. arrendare), in the forest laws of England, is the licensing an owner of land in a forest, to enclose it with a small ditch and low hedge, in consideration of an annual rent.