skos:Concept The event occurs once a year. Annual Annual The event occurs every two years. Biennial Biennial The event occurs every two months. Bimonthly Bimonthly The event occurs every two weeks. Biweekly Biweekly The event repeats without interruption. Continuous Continuous The event occurs once a day. Daily Daily The event occurs at uneven intervals. Irregular Irregular The event occurs once a month. Monthly Monthly The event occurs every three months. Quarterly Quarterly The event occurs twice a year. Semiannual Semiannual The event occurs twice a month. Semimonthly Semimonthly The event occurs twice a week. Semiweekly Semiweekly The event occurs three times a month. Three times a month Three times a month The event occurs three times a week. Three times a week Three times a week The event occurs three times a year. Three times a year Three times a year The event occurs every three years. Triennial Triennial The event occurs once a week. Weekly Weekly 2013-05-10 The Collection Description Frequency Namespace