- anniversaries
- anniversariesThe normal practice is to refer to the 10th, 20th, 30th, etc. anniversary of an event, but special names have come to be associated with the more significant anniversaries. The principal names for wedding anniversaries are silver (25 years), pearl (30), ruby (40), golden (50), and diamond (60, sometimes 75). For public events the following terms are used: centenary or (AmE) centennial (100), sesquicentenary (150 years), bicentenary (200), tercentenary (300), quatercentenary (400: NB not quarter-), quincentenary (500), sexcentenary (600), septcentenary (700), octocentenary (800), millenary (1,000). In AmE, the compounds end in -centennial rather than -centenary. See centenary.
Modern English usage. 2014.