Cube/kjuːb/ Definition 1 of 4Pro Tip 1/3Geometric Shape A 'cube' is often used in geometry to teach three-dimensional shapes. Could you calculate the volume of this cube? Pro Tip 2/3Many Uses 'Cube' appears in various contexts from toys like Rubik's Cube to ice cube trays. I need to buy a new ice cube tray. Pro Tip 3/3Cultural Symbol The cube can symbolize stability and order in artistic and cultural contexts. The sculpture was a large metal cube representing the city's strength.