Webster's Revised Unabridged Dictionary · 1913

Centenary

Centenary , adjective

[Latin centenarius, from centum a hundred.]

1.
Relating to, or consisting of, a hundred.
2.
Occurring once in every hundred years; centennial.
Centenary solemnities. — Fuller

Centenary ({not transcribed}) , noun

1.
The aggregate of a hundred single things; specifically, a century.
Every centenary of years. — Hakewill
2.
A commemoration or celebration of an event which occurred a hundred years before.