unit — a single thing or person regarded as separate and complete

construction workers carefully position a complete prefabricated apartment section using a crane. The self-contained module has windows, walls, and interior fixtures already installed as one piece. As they lower it into place, it fits perfectly between other identical apartment sections. The workers guide the unit into its designated spot in the larger building structure. Other crew members watch from nearby as this single complete dwelling becomes part of the whole apartment complex. a single thing regarded as separate and complete being integrated into a larger structure