The Collaborative International Dictionary
Gainage
Gainage \Gain"age\ (?, 48), n. [OF. gaignage pasturage, crop, F. gaignage pasturage. See Gain, v. t.] (O. Eng. Law)
The horses, oxen, plows, wains or wagons and implements for carrying on tillage.
The profit made by tillage; also, the land itself.
--Bouvier.
Wiktionary
gainage
n. 1 (context UK legal obsolete English) The horses, oxen, ploughs, wains or wagons and implements for carrying on tillage. 2 The profit made by tillage; also, the land itself.