of, relating to, or celebrating a 600th anniversary
nounWord forms: plural-naries
3.
a 600th anniversary or its celebration
Word origin
C18: from Latin sexcentēnī six hundred each
sexcentenary in American English
(ˌsekssenˈtenəri, seksˈsentnˌeri, esp Brit -senˈtinəri) (nounplural -naries)
adjective
1.
pertaining to 600 or a period of 600 years; marking the completion of 600 years
noun
2.
a 600th anniversary or its celebration
Word origin
[1770–80; sex- + centenary]This word is first recorded in the period 1770–80. Other words that entered Englishat around the same time include: advisory, charade, crescendo, extra, red flag