<p><strong>Noun</strong></p><ul><li>an act or instance of oscillating.</li><li>a single swing or movement in one direction of an oscillating body.</li><li>fluctuation between beliefs, opinions, conditions, etc.</li><li>Physics: an effect expressible as a quantity that repeatedly and regularly fluctuates above and below some mean value, as the pressure of a sound wave or the voltage of an alternating current.</li><li>a single fluctuation between maximum and minimum values in such an effect.</li><li>Mathematics: the difference between the least upper bound and the greatest lower bound of the functional values of a function in a given interval.</li></ul>