centenary

adjective

1. of or relating to a period of 100 years.
2. recurring once in every 100 years: a centenary celebration.

noun, plural cen·ten·ar·ies.

3. a centennial.
4. a period of 100 years; century.

adjective

1. of or relating to a period of 100 years
2. occurring once every 100 years

noun plural -naries

3. a 100th anniversary or its celebration

adj.

c.1600, “period of 100 years,” from Latin centenarius “of a hundred, relating to a hundred,” from centenai “a hundred each,” from centum “hundred” (see hundred). As a noun, “100th anniversary,” from 1788.