quadricentennial

quadricentennial

[kwod-ruh-sen-ten-ee-uhl]
adjective
1.
of, pertaining to, or marking the completion of a period of four hundred years.
noun
2.
a quadricentennial anniversary.
3.
its celebration.

Origin:
1880–85; quadri- + centennial

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quadricentennial (ˌkwɒdrɪsɛnˈtɛnɪəl)
 
n
1.  a 400th anniversary
 
adj
2.  of, relating to, or celebrating a 400th anniversary

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