Definition of "quatercentennial" [quatercentennial]

• The 400th anniversary (or the celebration of it) (noun)

WordNet. Princeton University. 2010.

• "Obviously, then, Oxford has ample reason to celebrate the KJV's quatercentennial, which it is doing with Campbell's "Bible" as well as the aforementioned deluxe edition, which it describes as "the most authentic version of the original text that has ever been published.""