QUINCENTENARY
\kwˌɪnsəntˈiːnəɹi], \kwˌɪnsəntˈiːnəɹi], \k_w_ˌɪ_n_s_ə_n_t_ˈiː_n_ə_ɹ_i]\
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of or relating to a 500th anniversary; "the quincentennial celebration of the founding of the city"
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the 500th anniversary (or the celebration of it)
By Princeton University