Definitions from Wiktionary (periodic)

▸ adjective:  Relative to a period or periods.
▸ adjective:  Having repeated cycles.
▸ adjective:  Occurring at regular intervals.
▸ adjective:  Periodical.
▸ adjective:  (astronomy) Pertaining to the revolution of a celestial object in its orbit.
▸ adjective:  (mathematics, stochastic processes, of a state) For which any return to it must occur in multiples of k time steps, for some k>1.
▸ adjective:  (rhetoric) Having a structure characterized by periodic sentences.
▸ adjective:  Relating to the highest oxidation state of iodine; of or derived from a periodic acid.

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