<Table> <Tr> <Th> Anniversary </Th> <Th> Latin - derived term </Th> <Th> Other terms </Th> <Th> Comments </Th> </Tr> <Tr> <Td> 1⁄2 yearly </Td> <Td> Semiannual </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 1 year </Td> <Td> Annual </Td> <Td> Paper </Td> <Td> </Td> </Tr> <Tr> <Td> 2 years </Td> <Td> Biennial </Td> <Td> Cotton </Td> <Td> </Td> </Tr> <Tr> <Td> 3 years </Td> <Td> Triennial </Td> <Td> Leather </Td> <Td> </Td> </Tr> <Tr> <Td> 4 years </Td> <Td> Quadrennial </Td> <Td> Linen </Td> <Td> </Td> </Tr> <Tr> <Td> 5 years </Td> <Td> Quinquennial </Td> <Td> Wood </Td> <Td> </Td> </Tr> <Tr> <Td> 6 years </Td> <Td> Sexennial </Td> <Td> Iron </Td> <Td> </Td> </Tr> <Tr> <Td> 7 years </Td> <Td> Septennial </Td> <Td> Wool </Td> <Td> </Td> </Tr> <Tr> <Td> 8 years </Td> <Td> Octennial </Td> <Td> Bronze </Td> <Td> </Td> </Tr> <Tr> <Td> 9 years </Td> <Td> Novennial </Td> <Td> Copper </Td> <Td> </Td> </Tr> <Tr> <Td> 10 years </Td> <Td> Decennial </Td> <Td> Tin / Aluminium </Td> <Td> </Td> </Tr> <Tr> <Td> 11 years </Td> <Td> Undecennial </Td> <Td> Steel </Td> <Td> </Td> </Tr> <Tr> <Td> 12 years </Td> <Td> Duodecennial </Td> <Td> Silk </Td> <Td> </Td> </Tr> <Tr> <Td> 13 years </Td> <Td> Tredecennial </Td> <Td> Lace </Td> <Td> </Td> </Tr> <Tr> <Td> 14 years </Td> <Td> Quattuordecennial </Td> <Td> Ivory </Td> <Td> </Td> </Tr> <Tr> <Td> 15 years </Td> <Td> Quindecennial </Td> <Td> Crystal </Td> <Td> </Td> </Tr> <Tr> <Td> 20 years </Td> <Td> Vigintennial / Vicennial </Td> <Td> China / Porcelain </Td> <Td> </Td> </Tr> <Tr> <Td> 25 years </Td> <Td> Quadranscentennial </Td> <Td> Silver jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 40 years </Td> <Td> Quadragennial </Td> <Td> Ruby jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 50 years </Td> <Td> Semicentennial / Quinquagenary </Td> <Td> Golden jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 60 years </Td> <Td> Sexagennial / Sexagenary </Td> <Td> Diamond jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 65 years </Td> <Td> </Td> <Td> Sapphire jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 70 years </Td> <Td> Septuagennial </Td> <Td> Platinum jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 100 years </Td> <Td> Centennial </Td> <Td> Centenary </Td> <Td> </Td> </Tr> <Tr> <Td> 125 years </Td> <Td> Quasquicentennial </Td> <Td> </Td> <Td> Term is broken down as quasqui - ( and a quarter ) centennial ( 100 years ) . Quasqui is a contraction from quadrans `` a quarter '' plus the clitic conjunction - que `` and '' . The term was coined by Funk and Wagnalls editor Robert L. Chapman in 1961 . </Td> </Tr> <Tr> <Td> 150 years </Td> <Td> Sesquicentennial </Td> <Td> </Td> <Td> Term broken down as sesqui - ( one and a half ) centennial ( 100 years ) </Td> </Tr> <Tr> <Td> 175 years </Td> <Td> Dodransbicentennial </Td> <Td> </Td> <Td> Dodrans is a Latin contraction of de-quadrans which means `` a whole unit less a quarter '' ( de means `` from '' ; quadrans means `` quarter '' ) . 175 years is a quarter century less than the next whole ( bi ) century or 175 = ( − 25 + 200 ) . </Td> </Tr> <Tr> <Td> Dodrabicentennial </Td> <Td> Alternative Latin form of Dodransbicentennial </Td> </Tr> <Tr> <Td> Dequasbicentennial </Td> <Td> Alternative Latin form of Dodransbicentennial </Td> </Tr> <Tr> <Td> Dosquicentennial </Td> <Td> Dosquicentennial has been used in modern times and this is perhaps a modern contraction of `` de-quadrans '' . However , it seems inappropriate to combine the terms que and de when dealing with such Roman fractions . In any event , if such a conjunction was appropriate then it would perhaps more likely have been `` Dosquibicentennial '' ( but the result is little shorter anyway ) . </Td> </Tr> <Tr> <Td> Demisemiseptcentennial </Td> <Td> Probably a modern coined term : demisemiseptcentennial ; literally one - half ( demi - ) × one - half ( semi - ) × seven ( sept - ) × 100 years ( centennial ) -- also demisemiseptcentenary . </Td> </Tr> <Tr> <Td> Quartoseptcentennial </Td> <Td> Probably a modern coined term : quartoseptcentennial ; literally one - quarter ( quarto - ) × seven ( sept - ) × 100 years ( centennial ) -- also quartoseptcentenary . </Td> </Tr> <Tr> <Td> Terquasquicentennial </Td> <Td> First used by Bell Laboratories in celebrating its 175th anniversary as a corporation . Is a coined word for an anniversary of 175 years , but the elements of the word literally refer to an anniversary of 375 years , as follows : ter - ( 3 ) × quasqui - ( 11⁄4 ) × centennial ( 100 years ) </Td> </Tr> <Tr> <Td> Septaquintaquinque - centennial </Td> <Td> Suggested by lexicographer Robert L. Chapman
<Table> <Tr> <Th> Anniversary </Th> <Th> Latin - derived term </Th> <Th> Other terms </Th> <Th> Comments </Th> </Tr> <Tr> <Td> 1⁄2 yearly </Td> <Td> Semiannual </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 1 year </Td> <Td> Annual </Td> <Td> Paper </Td> <Td> </Td> </Tr> <Tr> <Td> 2 years </Td> <Td> Biennial </Td> <Td> Cotton </Td> <Td> </Td> </Tr> <Tr> <Td> 3 years </Td> <Td> Triennial </Td> <Td> Leather </Td> <Td> </Td> </Tr> <Tr> <Td> 4 years </Td> <Td> Quadrennial </Td> <Td> Linen </Td> <Td> </Td> </Tr> <Tr> <Td> 5 years </Td> <Td> Quinquennial </Td> <Td> Wood </Td> <Td> </Td> </Tr> <Tr> <Td> 6 years </Td> <Td> Sexennial </Td> <Td> Iron </Td> <Td> </Td> </Tr> <Tr> <Td> 7 years </Td> <Td> Septennial </Td> <Td> Wool </Td> <Td> </Td> </Tr> <Tr> <Td> 8 years </Td> <Td> Octennial </Td> <Td> Bronze </Td> <Td> </Td> </Tr> <Tr> <Td> 9 years </Td> <Td> Novennial </Td> <Td> Copper </Td> <Td> </Td> </Tr> <Tr> <Td> 10 years </Td> <Td> Decennial </Td> <Td> Tin / Aluminium </Td> <Td> </Td> </Tr> <Tr> <Td> 11 years </Td> <Td> Undecennial </Td> <Td> Steel </Td> <Td> </Td> </Tr> <Tr> <Td> 12 years </Td> <Td> Duodecennial </Td> <Td> Silk </Td> <Td> </Td> </Tr> <Tr> <Td> 13 years </Td> <Td> Tredecennial </Td> <Td> Lace </Td> <Td> </Td> </Tr> <Tr> <Td> 14 years </Td> <Td> Quattuordecennial </Td> <Td> Ivory </Td> <Td> </Td> </Tr> <Tr> <Td> 15 years </Td> <Td> Quindecennial </Td> <Td> Crystal </Td> <Td> </Td> </Tr> <Tr> <Td> 20 years </Td> <Td> Vigintennial / Vicennial </Td> <Td> China / Porcelain </Td> <Td> </Td> </Tr> <Tr> <Td> 25 years </Td> <Td> Quadranscentennial </Td> <Td> Silver jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 40 years </Td> <Td> Quadragennial </Td> <Td> Ruby jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 50 years </Td> <Td> Semicentennial / Quinquagenary </Td> <Td> Golden jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 60 years </Td> <Td> Sexagennial / Sexagenary </Td> <Td> Diamond jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 65 years </Td> <Td> </Td> <Td> Sapphire jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 70 years </Td> <Td> Septuagennial </Td> <Td> Platinum jubilee </Td> <Td> </Td> </Tr> <Tr> <Td> 100 years </Td> <Td> Centennial </Td> <Td> Centenary </Td> <Td> </Td> </Tr> <Tr> <Td> 125 years </Td> <Td> Quasquicentennial </Td> <Td> </Td> <Td> Term is broken down as quasqui - ( and a quarter ) centennial ( 100 years ) . Quasqui is a contraction from quadrans `` a quarter '' plus the clitic conjunction - que `` and '' . The term was coined by Funk and Wagnalls editor Robert L. Chapman in 1961 . </Td> </Tr> <Tr> <Td> 150 years </Td> <Td> Sesquicentennial </Td> <Td> </Td> <Td> Term broken down as sesqui - ( one and a half ) centennial ( 100 years ) </Td> </Tr> <Tr> <Td> 175 years </Td> <Td> Dodransbicentennial </Td> <Td> </Td> <Td> Dodrans is a Latin contraction of de-quadrans which means `` a whole unit less a quarter '' ( de means `` from '' ; quadrans means `` quarter '' ) . 175 years is a quarter century less than the next whole ( bi ) century or 175 = ( − 25 + 200 ) . </Td> </Tr> <Tr> <Td> Dodrabicentennial </Td> <Td> Alternative Latin form of Dodransbicentennial </Td> </Tr> <Tr> <Td> Dequasbicentennial </Td> <Td> Alternative Latin form of Dodransbicentennial </Td> </Tr> <Tr> <Td> Dosquicentennial </Td> <Td> Dosquicentennial has been used in modern times and this is perhaps a modern contraction of `` de-quadrans '' . However , it seems inappropriate to combine the terms que and de when dealing with such Roman fractions . In any event , if such a conjunction was appropriate then it would perhaps more likely have been `` Dosquibicentennial '' ( but the result is little shorter anyway ) . </Td> </Tr> <Tr> <Td> Demisemiseptcentennial </Td> <Td> Probably a modern coined term : demisemiseptcentennial ; literally one - half ( demi - ) × one - half ( semi - ) × seven ( sept - ) × 100 years ( centennial ) -- also demisemiseptcentenary . </Td> </Tr> <Tr> <Td> Quartoseptcentennial </Td> <Td> Probably a modern coined term : quartoseptcentennial ; literally one - quarter ( quarto - ) × seven ( sept - ) × 100 years ( centennial ) -- also quartoseptcentenary . </Td> </Tr> <Tr> <Td> Terquasquicentennial </Td> <Td> First used by Bell Laboratories in celebrating its 175th anniversary as a corporation . Is a coined word for an anniversary of 175 years , but the elements of the word literally refer to an anniversary of 375 years , as follows : ter - ( 3 ) × quasqui - ( 11⁄4 ) × centennial ( 100 years ) </Td> </Tr> <Tr> <Td> Septaquintaquinque - centennial </Td> <Td> Suggested by lexicographer Robert L. Chapman
how many years is quarter of a century
how many years is quarter of a century
25 years
25 years