Synonyms and related words :
annual, annually, biannual, biennial, bimonthly, biweekly, catamenial, centenary, centennial, daily, decennial, diurnal, fortnightly, hebdomadal, hourly, menstrual, momentary, momently, monthly, per annum, perennial, perennially, quarterly, quotidian, regular, regularly, secular, semestral, semiannual, semimonthly, semiweekly, semiyearly, tertian, triennial, weekly, year after year