<p><strong>Adjective</strong></p><ul><li>recurring at intervals of time: periodic revivals of an interest in handicrafts.</li><li>occurring or appearing at regular intervals: periodic visits by doctors to the village.</li><li>repeated at irregular intervals; intermittent: periodic outbreaks of the disease.</li><li>Physics. recurring at equal intervals of time.</li><li>Mathematics. (of a function) having a graph that repeats after a fixed interval period of the independent variable.</li><li>Astronomy. characterized by a series of successive circuits or revolutions, as the motion of a planet or satellite.</li><li>of or relating to a period, as of the revolution of a heavenly body.</li><li>pertaining to or characterized by rhetorical periods, or periodic sentences.</li></ul>