Definitions for "Periodic"
Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring; as, periodical epidemics.
occurring or recurring at regular intervals Minnehaha: Point-Source Pollution
Pertaining to, derived from, or designating, the highest oxygen acid (HIO?) of iodine.
Of or pertaining to a period or periods, or to division by periods.
Of or pertaining to a period; constituting a complete sentence.
Keywords:  halley, pluto, comet, repeatedly, cycle
Occurring regularly or repeatedly over time, like a cycle.
A comet captured into an orbit that stays within the orbit of the planet Pluto, such as Halley's Comet. The orbit may take a few years or a few hundred years to complete one cycle.