a hollow masonry building unit of cement, terra cotta, etc.: a wall made of concrete blocks. one of a set of cube-shaped pieces of wood, plastic, or the like, used as a child's toy in building. a mold or piece on which something is shaped or kept in shape: a hat block.
Neutral powers during World War II. The neutral powers were countries that remained neutral during World War II. Some of these countries had large colonies abroad or had great economic power.
The neutral wire is a return wire for the current in an electrical circuit. Do not confuse for the ground wire which is also a return wire but is used in the event the connected appliance shorts to protect the user from electrical shock.