Belending means abutting or adjoining. You may come across the term in notarial or court records involving properties. The belendende percelen are the abutting properties, that share a property boundary with the property that is being discussed.
Many Dutch land records before the introduction of the Cadaster in 1832 identify the location of properties in terms of its neighbors, sometimes with cardinal directions, but often just in terms of “in between the houses of so-and-so.” Sometimes, the word belend (abutted) introduces the list of neighboring properties.