Etymology From Late Latin centennium (“period of 100 years, century”) + English -al (suffix forming adjectives and nouns).
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.
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, […]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: