"100 cc" refers to the engine displacement or engine capacity of a motorcycle or any other internal combustion engine. The term "cc" stands for cubic centimeters, which is a unit of measurement used to denote the volume of the engine's cylinders.
In the case of motorcycles, the engine displacement is a measurement of the total volume of all the cylinders combined. It represents the total amount of air and fuel that the engine can draw in and combust during one complete engine cycle.
Therefore, when a motorcycle is referred to as "100 cc," it means that the total volume of its engine cylinders is 100 cubic centimeters. Engine displacements can vary widely, and motorcycles are available in a range of sizes, from smaller 50 cc engines to larger ones exceeding 1,000 cc or more. The engine displacement is often used as an indication of the motorcycle's power and performance capabilities, although other factors such as engine design, technology, and tuning also play significant roles.