Cubic inch is a specific unit of volume measurement used primarily in the United States. There are several other synonyms for cubic inch that are used in different parts of the world. One such synonym is cubic centimeter, which is widely used in the metric system. Another synonym is displacement, which is a term often used in the automotive industry to refer to the volume of an engine's combustion chamber. Other synonyms for cubic inch include cubic feet, cubic meters, and cubic yards. While these synonyms may vary in their application and use, they all represent an amount of volume that can be easily quantified and measured.