aperiodic

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a·pe·ri·od·ic / ˌāpi(ə)rēˈädik/ • adj. technical not periodic; irregular: aperiodic fluctuations. ∎ Physics denoting a potentially oscillating or vibrating system (such as an instrument with a pointer) that is damped to prevent oscillation or vibration.DERIVATIVES: a·pe·ri·o·dic·i·ty / āˌpi(ə)rēəˈdisitē/ n.