Esplees

Fr. <k Eng. [L. Lat. expletia, from explere, to fill up.] In old practice. Full profits of land. The full profits or products which ground or land yields, as the hay of the meadows, the feed of the pasture, the com and grain of the arable; the rents, services and such like issues.

CowelL Blount

An essential word in writs of right. See Expletia, The lands themselves, from which such profits are derived.

Ducange.