periodic

Relative to a period or periods.

Having repeated cycles.

There was some laughter, and Roddle was left free to expand his ideas on the periodic visits of cowboys to the town. “Mason Rickets, he had ten big punkins a-sittin' in front of his store, an' them fellers from the Upside-down-F ranch shot 'em up […].”

Occurring at regular intervals.

That last problem did intrude on Hazzard’s roamings, and when she refers to the living city it is with periodic references to thefts of cars and wallets, with a warning not to carry anything “snatchable” by the thieves on motorcycles who whiz through the streets.

Periodical.

Pertaining to the revolution of a celestial object in its orbit.

Relating to the highest oxidation state of iodine; of or derived from a periodic acid.