Periodic movement refers to a motion that occurs in regular intervals or cycles. There are several synonyms to describe this type of movement, and some of them include repetitive motion, cyclic activity, oscillating movement, periodic oscillation, and back-and-forth movement. Other synonyms that may be used include recurrent motion, rhythmic motion, pulsating movement, and periodicity. These synonyms perfectly describe the behavior of periodic movements, such as the swinging of a pendulum, the beating of a heart, or the rise and fall of tides. Regardless of which synonym is used, they all convey the same idea of a repetitive motion that occurs in a regular pattern.