centennial

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centennial /sɛnˈtɛniəl/ noun
plural centennials
centennial
/sɛnˈtɛniəl/
noun
plural centennials
Learner's definition of CENTENNIAL
[count] US
: the 100th anniversary of something (such as an important event)
compare bicentennial

— centennial

adjective, always used before a noun