periodic
US /ˌpɪr.iˈɑː.dɪk/
UK /ˌpɪr.iˈɑː.dɪk/
1.
appearing or occurring at intervals
:
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The doctor recommended periodic check-ups.
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We experience periodic power outages during storms.
2.
relating to or denoting a periodic table or the elements in it
:
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The chemist studied the properties of elements using the periodic table.
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Understanding the periodic trends helps predict chemical behavior.