A measured piece of land or load — the cadastre's unit: bounded, named, placeable.
Latin particula (a small part), diminutive of pars (a part, share), via Old French parcelle; the cadastre's word for a measured, bounded piece of land descends from the ordinary word for a small share of anything.
A bounded, named, placeable piece of land or load — the cadastre's unit, and the house's word for anything measured out the same way.