aperiodic

/ˌeɪˌpɪriˈɑdɪk/
adjective
  1. Not occurring at regular intervals; not periodic.
    • The machine made an aperiodic clicking sound that was hard to predict.
    • The scientist studied aperiodic signals from the distant star.
    • Her aperiodic visits always surprised us, since she never came on the same day.
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