Definitions
1.adjectiveRelative to a period or periods.
2.adjectiveHaving repeated cycles.
3.adjectiveOccurring at regular intervals.
4.adjectivePeriodical.
5.adjectivePertaining to the revolution of a celestial object in its orbit.
6.adjective(stochastic processes, of a state) For which any return to it must occur in multiples of k time steps, for some k>1.
7.adjectiveHaving a structure characterized by periodic sentences.