tercentenary, ftercentenary, tercentenary

& 8. [Lat. ter =thrice, and cen tenarius =centenary (q. v.).] A. As adject .: Comprising three hundred years; including or relating to an interval of three hundred years. B. As subst .: A day celebrated or observed as a festival in commemoration of some event, as a great victory, ., which occurred three hundred years before. "Their noble president had accustomed himself to say 'tercenteenary. But all long words that ended in 'ary," 'ery,' 'ory,' were accented on the fourth syllable from the end, or what scholars called the 'pre antepenultimate.' (Laughter.) If his lordship's attention were called to that little law, he would adapt his pronunciation to the common one, and would speak of the ' ter - cent - enary .'"London Daily News.