Webster's English Dictionary

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periodic

Cross references:
  1. intermittent          
 
pe.ri.od.ic \.pir-e--'a:d-ik\ aj 1a: occurring at regular intervals  1b: 
   RECURRENT  2: consisting of or containing a series of repeated stages : 
   CYCLICM {~ decimals} 3: of or relating to a period  4: expressed in or 
   characterized by periodic sentences