# What Do We Call A Period Of 5 Years?

## What do we call 15 years?

Historically units of time were defined by the movements of astronomical objects.

Year-based units include the olympiad (four years), the lustrum (five years), the indiction (15 years), the decade, the century, and the millennium.

Moon-based: the month was based on the moon’s orbital period around the earth..

## What do you call a period of 5 years?

These censuses were taken at five-year intervals, thus a lustrum came to refer to the five-year inter-census period. … As this purification took place only once in five years, the word lustrum was also used to designate the time between two lustra.

## How many years is a quinquennial?

five yearsnoun. something that occurs every five years.

## What is a period of 12 years called?

Duodecennial word can be used as alternatively for a gap once in 12 years .

## What is a period of 30 years called?

• A period of 30 years is equal to 3 decades. Because, 10 years = 1 decade.

## What do we call 100 years?

a centennial. a period of 100 years; century.

## Is there a word for 30 years?

Tricenarian definitions A person whose age is between thirty and thirty-nine years, inclusive; someone in his or her thirties.

## How do you say every 5 years?

quin•quen•ni•alof or lasting for five years.occurring every five years.a quinquennium.something that occurs every five years.quin•quen′ni•al•ly, adv.

## What is three times a year called?

Triannual is commonly used to mean one of two things: occurring once every three years or occurring three times per year. Triannual is a synonym of the less commonly used triennial, which can mean every three years or lasting for three years (though triannual is rarely if ever used in this second sense.)

## What is a 1000 years called?

Millennium, a period of 1,000 years.

## How many years are in 50 years?

The most obvious answer is: half a century, or a half century as David pointed out. However, you could still choose to say 50 years, or 5 decades, depending on the context of what you are talking about. The word century comes from Latin centuria “group of one hundred” and from centum “hundred”.

## What is 50 years old called?

A person between 50 and 59 is called a quinquagenarian. A person between 60 and 69 is called a sexagenarian. A person between 70 and 79 is called a septuagenarian. A person between 80 and 89 is called an octogenarian.

## What is 500 years called?

Noun. 1. quincentenary – the 500th anniversary (or the celebration of it) quincentennial.

## What is a period of 20 years called?

10 years = a Decade, 20 years = 2 Decades. 30 years = 3 Decades. 40 years = 4 Decades. 50 years = 5 Decades or Half a Century and so on.Other words for years are.

## What’s the name for 10 years?

Since, 10 years = a Decade, (via French and Latin) which means ‘a group of ten.

## What is every 2 years called?

occurring twice a year; semiannual. occurring every two years; biennial.

## What is the word for half a decade?

A demi-decade is a period of time considered to be equivalent to half a decade, roughly five years. … Prototypically this milestone falls in years which end in the number 5, since the most common perception of a decade is the run of years ending in digits 0 to 9.