periodic

 
Pronunciation: /ˌpɪərɪˈɒdɪk/

adjective

  • 1appearing or occurring at intervals: the periodic visits she made to her father
  • 2 Chemistry relating to the periodic table of the elements.
  • 3relating to a rhetorical period.

Origin:

mid 17th century: from French périodique, or via Latin from Greek periodikos 'coming round at intervals', from periodos (see period)