/os'euh lay"sheuhn/ , n.
1. an act or instance of oscillating.
2. a single swing or movement in one direction of an oscillating body.
3. fluctuation between beliefs, opinions, conditions, etc.
a. 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.
b. a single fluctuation between maximum and minimum values in such an effect.
a. the difference between the least upper bound and the greatest lower bound of the functional values of a function in a given interval.
b. Also called saltus . the limit of the oscillation in an interval containing a given point, as the length of the interval approaches zero.
[ 1650-60; oscillation- (s. of oscillatio ) a swinging, equiv. to oscillat ( us ) (see OSCILLATE) + -ion- -ION ]