Entrainment has been used to refer to the process of mode locking of coupled driven oscillators, which is the process whereby two interacting oscillating systems, which have different periods when they function independently, assume a common period. The two oscillators may fall into synchrony, but other phase relationships are also possible. The system with the greater frequency slows down, and the other speeds up. Wikipedia, Entrainment
See Also
Coupling
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Harmony
Law of Cycles
Law of Force
Resonance
Sympathetic Oscillation
Sympathetic Vibration