Latin, adjacientia, appendentium; adjacere.
Appurtenances, appendages (appendentium), and other elements said to be attached (adjacere) to a manor, were those parts of the manor other than the arable and plough teams: meadow, pasture, woodland, mills, churches, vineyards, and many other features, including the majority of those which involved the payment of customary dues. The manorial appurtenances were normally grouped together at the end of the description of each manor. Though the words themselves occur only occasionally, the majority of manors had appurtenances or appendages
Despite its known flaws, this data is invaluable for major aspects of the early medieval economy. Domesday Book, for instance, records more than 99% of the mills known to have existed prior to the end of the eleventh century. The woodland, meadow and pasture recorded in Domesday also provides the overwhelming bulk of the evidence on those topics for early medieval history .
For more detail, see H.C. Darby, Domesday England (1977).