How do you spell Centennial

Available Definitions:
1)  a. - Relating to, or associated with, the commemoration of an event that happened a hundred years before; as, a centennial ode.
2)  a. - Happening once in a hundred years; as, centennial jubilee; a centennial celebration.
3)  a. - Lasting or aged a hundred years.
4)  n. - The celebration of the hundredth anniversary of any event; a centenary.