noun
the tendency to recur at regular intervals
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The periodicity of the sun's rotation around the Earth is crucial for determining day and night.
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I noticed a pattern or periodicity in the way she organizes her desk every week.
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Dude, there's like this weird periodicity to how my cat knocks things off the table every morning.
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The periodicity of his mood swings makes it hard to predict how he will react in different situations.