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Date: Monday, January 1, 2001 
Question/Topic: Centennial, bicentennial, sesquicentennial 
Answer/Pointer: annually - yearly; occuring once every 12 months biannually - occurring twice a year (at unequally spaced intervals) bicentennial - relating to a period of 200 years biennial - relating to a period of 2 years biweekly - occuring once every 2 weeks centennial - relating to a period of 100 years (1 century) daily - occuring once every 24 hours decennial - relating to a period of 10 years (1 decade) diurnal - daily; of a day duodecennial - relating to a period of 12 years fortnightly - occuring once every 2 weeks millennial - relating to a period of 1,000 years (1 millenium) monthly - occuring once every 30 days (approximately) novennial - relating to a period of 9 years octennial - relalating to a period of 8 years perennial - occuring year after year quadrennial - relating to a period of 4 years (1 olympiad) quadricentennial - relating to a period of 400 years quincentennial - relating to a period of 500 years semiannually - occuring once every 6 months (at equally spaced intervals) semicentennial - relating to a period of 50 years semidiurnal - occuring twice a day semimonthly - occuring twice a month semiweekly - occuring twice a week sesquicentennial - relating to a period of 150 years sexennial - relating to a period of 6 years thrice weekly - occurring three times a week triennial - relating to a period of 3 years trimonthly - occuring once every 3 monthly triweekly - occuring once every 3 weeks undecennial - relating to a period of 11 years vicennial - relating to a period of 20 years weekly - occuring once every 7 days Source: New York Public Library Desk Reference R 031 New, p. 9 
Librarian: LCLCPL 
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