adjective happening or recurring at regular intervals
Synonymsperiodical
Similarcyclicoscillatorydiurnaldailynightlyweeklysemiweeklyhourlyhalf-hourlyfortnightlyannualsemiannualbiennialtriennialmonthlybimonthlysemimonthlysemestralmidweekly
Oppositesaperiodic
Source: WordNet 3.1, Princeton University
