[ sen-ten-ee-uh l ]
/ sɛnˈtɛn i əl /


pertaining to, or marking the completion of, a period of 100 years.
pertaining to a 100th anniversary.
lasting 100 years.
100 years old.


a 100th anniversary or its celebration; centenary.

Origin of centennial

1790–1800; < Latin cent- 100 (see cent) + English -ennial pertaining to a period of years (extracted from biennial)

Related forms

cen·ten·ni·al·ly, adverbpre·cen·ten·ni·al, adjective

Can be confused

centenary centennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for centennial

British Dictionary definitions for centennial


/ (sɛnˈtɛnɪəl) /


relating to, lasting for, or completing a period of 100 years
occurring every 100 years


mainly US and Canadian another name for centenary

Derived Forms

centennially, adverb

Word Origin for centennial

C18: from Latin centum hundred, on the model of biennial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012