Air resistance is the force that opposes the motion of objects through air. This force can be described by a variety of different synonyms, each emphasizing a different aspect of the phenomenon. Some commonly used synonyms for air resistance include drag, friction, air drag, air friction, and aerodynamic resistance. Each of these words describes the same concept in slightly different terms, but all share the common feature of describing a force that opposes the forward motion of an object moving through air. Whether studying the aerodynamics of planes, designing a new car, or analyzing the movements of a cyclist, understanding the synonyms for air resistance is crucial to understanding the physics of motion through air.