Consisting of or lasting a hundred years; completing a hundred years: as, a centennial epoch; the centennial year.Existing for a century or more.Happening every hundred years; relating to or marking a centenary: as, a centennial celebration.n. The commemoration or celebration of an event which occurred a hundred years before: as, the centennial of American independence.n. A dice game in which the object is to secure pips, or multiples of pips, which will make the figures from 1 to 12, and then from 12 to 1, in numerical order.