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.
Concurrent powers. Concurrent powers are powers in nations with a federal system of government that are shared by both the federal government and each constituent political unit (such as a state or province). These powers may be exercised simultaneously within the same territory, in relation to the same body of citizens, and regarding the same subject-matter.