A period of one year can be called a year, or astronomically speaking, a revolution.
It's called a decade.
A period of 100 years is called a century.
silver jubley
It COULD be called a Gigayear, but in practice it is simply called "a billion years".
An 150 year celebration is called a Sesquicentennial celebration
An 150 year celebration is called a Sesquicentennial celebration
A period of one year can be called a year, or astronomically speaking, a revolution.
A ten year period is a decade.
a 12 month period is called a fiscal year, there is also a natural year.
A period of six months is called half a year.
A period of 1 thousand year is called a millennium.
The colonial period. The colonial period.
a five-year period is a quinquennium
It's called a decade.
A period of 100 years is called a century.
A millennium