周しゅう期き性せいしゅうきせいMeanings1nounperiodicity; cyclicityRefers to the property of recurring at regular intervals; used in scientific, mathematical, and general contexts.この現げん象しょうには周しゅう期き性せいが見みられる。This phenomenon shows periodicity.2noun which may take the genitive case particle 'no'periodic; cyclicUsed adjectivally with の to modify nouns, describing something that occurs or repeats at regular intervals.