an act or instance of oscillating.

a single swing or movement in one direction of an oscillating body.

fluctuation between beliefs, opinions, conditions, etc.

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.

a single fluctuation between maximum and minimum values in such an effect.

Mathematics .

the difference between the least upper bound and the greatest lower bound of the functional values of a function in a given interval.

Also called saltus. the limit of the oscillation in an interval containing a given point, as the length of the interval approaches zero.