oscillation

värähtely

kierto

heilahtelu the act of oscillating or the state of being oscillated
a regular periodic fluctuation in value about some mean
a single such cycle
puhekieltä puhekieltä 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 ∞) between the limit superior and limit inferior of the function near that point.
English oscillation
an English oscillation, a vibration, a shaking, a movement back and forth
an oscillation, a periodic variation
one cycle of such a variation