list of wedding anniversaries

The root elements of each word are literally multiplied together to create the anniversary name. For example, the word sesquicentennial (an anniversary of 150 years) is broken down as sesqui- (1½) x centennial (100 years). Sometimes new anniversary names are coined incorrectly by adding the root elements rather than multiplying them, with unfortunate results.

• Annual - 1 year
• Biennial - 2 years
• Triennial - 3 years
• Quadrennial - 4 years
• Quinquennial - 5 years
• Sexennial - 6 years
• Septennial - 7 years
• Octennial - 8 years
• Novennial - 9 years
• Decennial - 10 years
• Undecennial - 11 years
• Duodecennial - 12 years
• Tredecennial - 13 years
• Quattuordecennial - 14 years
• Vigintennial or vicennial - 20 years
• Semicentennial or quinquagenary - 50 years
• Semisesquicentennial - 75 years
  • Variations: Demisesquicentennial or hemisesquicentennial
• Centennial- 100 years
• Quasquicentennial - 125 years
• Sesquicentennial - 150 years
• Demisemiseptcentennial or quartoseptcentennial - 175 years
• • Note: Terquasquicentennial[1] 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) x quasqui- (1¼) x centennial (100 years)
  • Note: Septaquintaquinquecentennial[2] is a coined word for an anniversary of 175 years, but the elements of the word literally refer to an anniversary of 35,000 years, as follows: septaquinta- (70) x quinque- (5) x centennial (100 years)
• Bicentennial - 200 years
• Semiquincentennial - 250 years
• Tercentennial or tricentennial - 300 years
• Semiseptcentennial - 350 years
• Quadricentennial or quatercentenary- 400 years
• Quincentennial - 500 years
• Sexcentennial - 600 years
• Septcentennial or septuacentennial - 700 years
• Octocentennial - 800 years
• Nonacentennial - 900 years
• Millennial - 1000 years
• Bimillennial - 2000 years ref: wikipedia