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periodicity [periodicities]▼◼◼◼noun[UK: ˌpɪə.rɪə.ˈdɪ.sɪ.tɪ] [US: piː.riːə.ˈdɪ.sɪ.tiː]
intermittence▼◼◻◻noun[UK: ˌɪntəmˈɪtəns] [US: ˌɪntɚmˈɪtəns]
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