oscillation

noun
  1. 1

    The act of oscillating or the state of being oscillated

  2. 2

    A regular periodic fluctuation in value about some mean

  3. 3

    A single such cycle

  4. 4

    (of a function) defined for each point x in the domain of the function by \inf\left\{\mathrm{diam}(f(U))\mid U\mathrm{\ is\ a\ neighborhood\ of\ }x\right\}, and describes the difference (possibly โˆž) between the limit superior and limit inferior of the function near that point.

Source: https://en.wiktionary.org/wiki/oscillation