periodicities meaning

• [Medicine]
  The tendency of a phenomenon to recur at regular intervals; in biological systems,the recurrence of certain activities (including hormonal,cellular,neural) may be annual,seasonal,monthly,daily,or more frequently (ultradian).

Examples

1. periodicity of nuclear properties began to show up.
2. circadian rhythms show persistent, stable periodicities of about 24 hours.
3. regular irregularities occur with constant periodicity and are usually associated with partial heart block.
4. in some cell lines there is a similar periodicity in changes of cell surface antigenicity or response to wheat germ agglutinin.
5. algorithm analysis of periodicity of relational matrix