Periodic /(pẽr`ī̇*ŏd"ĭk)/

Per·i·od·ic

Periodic

a.
  1. Pertaining to, derived from, or designating, the highest oxygen acid (HIO4) of iodine. (Chem.)

Periodic

a.
  1. Of or pertaining to a period or periods, or to division by periods.
    The periodical times of all the satellites.
    — Sir J. Herschel.
  2. Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
  3. Happening, by revolution, at a stated time; returning regularly, after a certain period of time.
    The periodic return of a plant's flowering.
    — Henslow.
    To influence opinion through the periodical press.
    — Courthope.
  4. Acting, happening, or appearing, at fixed or somewhat variable intervals; recurring; as, periodical epidemics
  5. Of or pertaining to a period; constituting a complete sentence. (Rhet.)