Centennial

adj. of or pertaining to a period of 100 years; pertaining to a 100th anniversary

n. 100th anniversary

A centennial or a centenary is a 100-year anniversary.Governments often declare a Centennial Day in honor of such anniversaries. Some monarchies, including the Low Countries, allow organisations that have celebrated their centennial anniversary to adopt (or petition for) the entirely honorary predicate 'Royal' (or its equivalent, e.g. koninklijk in Dutch).
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Noun
1. the 100th anniversary (or the celebration of it)
(synonym) centenary
(hypernym) anniversary, day of remembrance
Adjective
1. of or relating to or completing a period of 100 years; "centennial celebration"
(synonym) centenary
(pertainym) century

(n.)
The celebration of the hundredth anniversary of any event; a centenary.
  

(a.)
Relating to, or associated with, the commemoration of an event that happened a hundred years before; as, a centennial ode.
  

(a.)
Lasting or aged a hundred years.
  

(a.)
Happening once in a hundred years; as, centennial jubilee; a centennial celebration.
  

adj.
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