noun
a hypothetical cycle in psychological or emotional functioning
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Research has shown that individuals have unique biorhythms that can affect their daily performance.
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I can never seem to get my biorhythm in sync with my work schedule.
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My biorhythm is all over the place today, I just can't seem to focus.
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Her biorhythm seemed to be in tune with the natural world, always knowing when to rest and when to be active.