C anniversary annual annual holiday biannual bicentenary bicentennial biennial bimonthly birthday bissextile day biweekly catamenial cental centare centenarian centenary centennium centesimal centigrado centigram centimeter centipede centistere centred centref centrev centumvir centumvirate centuple centuplicate centurial centurion century commemoration cwt daily decennial diamond jubilee diurnal fortnightly golden wedding anniversary gross hebdomadal hecatomb holy days hourly hundred hundredfold hundredth hundredweight immovable feast jubilee leap year long hundred menstrual momentary momently monthly name day natal day octennial one C quadrennial quarterly quasquicentennial quincentenary quincentennial quinquennial quotidian secular semestral semiannual semimonthly semiweekly semiyearly septennial sesquicentenary sesquicentennial sextennial silver wedding anniversary tercentenary tercentennial tertian tricennial triennial wedding anniversary weekly yearly