centennial

From Late Latin centennis (“100-year”) + -al.

• (UK, US) IPA^(key): /sɛnˈtɛnɪəl/

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centennial (not comparable)

1. Relating to, or associated with, the commemoration of an event that happened a hundred years before.

   a centennial ode

2. Happening once in a hundred years.

   a centennial jubilee    a centennial celebration

3. Lasting or aged a hundred years.
   • 1863 November 23, Henry Wadsworth Longfellow, “The Student’s Tale. The Falcon of Ser Federigo.”, in Tales of a Wayside Inn, Boston, Mass.: Ticknor and Fields, →OCLC, page 34:

     In her grand villa, half-way up the hill, / O'erlooking Florence, but retired and still; / With iron gates, that opened through long lines / Of sacred ilex and centennial pines, […]

• hundred-year-old, centenary

centennial (plural centennials)

1. The hundredth anniversary of an event or happening.

• centenary

• centennially
• multicentennial, semicentennial, quasquicentennial, sesquicentennial, bicentennial, tricentennial, quadricentennial, quincentennial, sexcentennial, septicentennial, octocentennial

• Thesaurus:frequency

• “centennial, adj. and n.”, in OED Online ⁠, Oxford, Oxfordshire: Oxford University Press, 2021.