Not occurring at regular intervals; irregular or aperiodic; in mathematics and physics, not following a periodic pattern.
From Latin 'extra' (outside) + 'periodic' (from Greek 'periodikos', returning at intervals, from 'periodos' a cycle). This is primarily a scientific and mathematical term.
Chaotic systems like weather or turbulent water flow are extraperiodic—they don't follow predictable patterns—which is why we can't accurately predict weather beyond about 2 weeks even with supercomputers, yet periodic systems like planetary orbits we can predict for centuries.
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