November of 2007 marked the one-hundredth anniversary of Oklahoma becoming a state. On November 16, 1907, Oklahoma, which was formed by combining Indian Territory and Oklahoma Territory, became the forty-sixth state to be admitted to the United States. People across the state marked the occasion with a number of centennial celebrations that occurred on November 16, 2007. Based on its context in the paragraph above, what is the meaning of the word centennial?
A.
election day
B.
traditional pow-wow
C.
annual census
D.
hundredth anniversary