<p><strong>Adjective:</strong></p><ul><li>Of or relating to a period of 100 years.</li><li>Recurring once in every 100 years: a centenary celebration.</li></ul><p><strong>Noun:</strong></p><ul><li>Plural: centenaries.</li><li>A centennial.</li><li>A period of 100 years; century.</li></ul>