noun

• the act of oscillating or the state of being oscillated
• a regular periodic fluctuation in value about some mean
• a single such cycle
• (mathematics) (of a function) defined for each point x in the domain of the function by inf diam(f(U))∣Uisaneighborhoodofx, and describes the difference (possibly ∞) between the limit superior and limit inferior of the function near that point.