(PE) Groups of logically related fields which occur multiple times within a group.
Periodic groups are a non-relational technique. An example of a PE would be for storing the history of a person’s name changes, where name was kept in logically related fields such as surname, first name and middle name – with the person having changed their name more than once.
[peer-ee-uh-dis-i-tee] /ˌpɪər i əˈdɪs ɪ ti/ noun 1. the character of being ; the tendency to recur at regular intervals. n. 1805, from French périodicité (1796), from périodique, from Latin periodicus (see periodic). periodicity pe·ri·o·dic·i·ty (pĭr’ē-ə-dĭs’ĭ-tē) n.
[peer-ee-od-ik, peer-] /ˈpɪər iˈɒd ɪk, ˌpɪər-/ noun, Chemistry. 1. the law that the properties of the elements are periodic functions of their atomic numbers. 2. Also called Mendeleev’s law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights. […]
[peer-ee-od-ik, peer-] /ˈpɪər iˈɒd ɪk, ˌpɪər-/ noun, Physics. 1. any motion that recurs in identical forms at equal intervals of time. periodic motion See harmonic motion.
- Periodic neutropenia
periodic neutropenia n. Neutropenia recurring at regular intervals, associated with various types of infectious diseases. Also called cyclic neutropenia.