100 years. 
pertaining to a 100th anniversary. lasting 100 years. 100 years old.
What are 100 years called?
a centennial. a period of 100 years; century.
What is the word for 100th anniversary?
‘Centenary‘ is more popular in British English, while ‘centennial’ is preferred in the United States.
How many years are in a centenary?
A centennial, or centenary in British English, is a 100th anniversary or otherwise relates to a century, a period of 100 years.
What is 500 years called?
Definition of quincentenary
 : a 500th anniversary or its celebration.
What is 2 decades called?
adjective. vi·cen·ni·al | vī-ˈse-nē-əl
What are 20 years called?
vicennial. / (vɪˈsɛnɪəl) / adjective. occurring every 20 years. relating to or lasting for a period of 20 years.
What is a 125 year jubilee called?
The word quasquicentennial, meaning ‘125th anniversary, was engineered by… well, an engineer!
What is a word for 1000 years?
Since in Latin mille means “thousand”, a millennium lasts 1,000 years.
What’s a group of twenty called?
20 (twenty; Roman numeral XX) is the natural number following 19 and preceding 21. A group of twenty units may also be referred to as a score.
Is a centennial 100 years?
lasting 100 years. 100 years old. a 100th anniversary or its celebration; centenary.
What is a centennial anniversary?
Definition of centennial
 : a 100th anniversary or its celebration.
What is the difference between century and centenary?
The word century comes from the Latin centum, meaning one hundred. Century is sometimes abbreviated as c. A centennial or centenary is a hundredth anniversary, or a celebration of this, typically the remembrance of an event which took place a hundred years earlier.
What is every 10 years called?
Definition of decennial
 1 : consisting of or lasting for 10 years. 2 : occurring or being done every 10 years the decennial census. Other Words from decennial More Example Sentences Learn More About decennial.
What do we call 50 years?
golden jubilee: 50th anniversary. diamond jubilee: 60th anniversary (or 75th anniversary) platinum jubilee: 70th anniversary.
What is a period of 25 years called?
A period of 25 years is a “Generation“.
What is a period of 5 years called?
Definition of quinquennial
 1 : consisting of or lasting for five years. 2 : occurring or being done every five years. Other Words from quinquennial Example Sentences Learn More About quinquennial.
What is a 40 year old called?
quadragenarian
A person between 30 and 39 is called a tricenarian. A person between 40 and 49 is called a quadragenarian. A person between 50 and 59 is called a quinquagenarian. A person between 60 and 69 is called a sexagenarian.
What is a period of 12 years called?
12 years. Duodecennial. Silk. 12 1⁄2 years.
Is there a word for 15 years?
of or relating to a period of 15 years or the 15th occurrence of a series, as an anniversary.
What is a million years called?
The word millennium derives from the Latin mille, thousand, and annus, year.
