The word decade comes from the Greek word ‘dekas,’ which means a ten-person group. The Romans coined the term decade from the syllable dec-, which they used to describe anything gathered in tens: decathlon, decagon, and so on. The two names refer to a group of ten items. As a result, the prefix dec- was added to the calendar to indicate the passage of ten years.

In 1590, the term “decade” was officially added to the English lexicon. It is commonly used to refer to every ten years during the course of a century. For example, the 1680s or 1930s refers to the period from 1680 to 1689.

Decades are used to signify distinct periods in the Georgian calendar. Because their calendar does not include a zero, the 1850s are defined as the years 1851 to 1860.

When it comes to defining specific decades in a century, the Georgian calendar differs from the regular calendar. The eighties, for example, usually refer to the years 1980-1989. The 190th decade, on the Georgian calendar, falls between 1981 and 1990.

How Long is a Decade?

The use of decades to represent a ten-year period has made it easier for humanity to discern important historical events. Decades have made it possible for humans to readily recognize specific historical events, such as the 40s or 30s, which refer to the 1940s and 1930s, respectively.

Each decade is given a moniker based on noteworthy events that occurred during that time period. The ‘roaring twenties,’ which refers to the period in the 1920s when there was a lot of cultural change and economic expansion, is a good example in US history.

Most historical events are separated into decades, making it easier for people to discern between events at different times in history.

Apart from historical events, age can be divided into decades.

The term decade has also been applied to the era in the 1990s when Japan’s economy crashed. The period was known as the “Lost Decade,” and it occurred just after World War II.

When the Finance Minister raised interest rates, the economy crashed. The failure of the stock market as a result of the price rise harmed the country’s economic progress.

The crisis lasted nearly a decade and continues to impact the Japanese corporate industry today.

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What is a period of 20 years called?

Vicennial’s History and Etymology

akin to Latin viginti twenty — more at vigesimal, annual; late Latin vicennium period of 20 years, from Latin vicies 20 times + annus year; related to Latin viginti twenty — more at vigesimal, yearly.

What is a 50-year span called?

A period of fifty years is referred to as semi-centennial; if ten years is referred to as a decade, then fifty years might be referred to as five decades; it is also half a century.

What are 100 years called?

A one-hundredth anniversary.  A century is a period of 100 years.

What is 500 years called?

Quincentenary: The five-hundredth anniversary of a significant event.

What are 1000 years called?

A period of 1000 years is called a millennium.

What are the other terms used in the Calendar?

 A century is a period of one hundred years, such as the nineteenth century. The nineteenth-century spans the years 1901 to 2000. A bicentennial is defined as a span of 200 years.

• The term “millennium” refers to 1000 years.
• One million years is referred to as a megaannum.
• A fortnight is a period of two weeks.
• A score lasts for 20 years, while a lustrum lasts for five.
• A biennium, triennium, or quadrennium is a period of time that lasts two, three, or four years.

Conclusion

A decade is defined as ten years.

A century is equal to 100 years.

A millennium is a period of 1,000 years.

“Dec” stands for ten, just as the month “December,” which begins with “Dec” since it was the tenth month of the year in the Roman calendar.

A “cent” indicates 100, just as a dollar has 100 “Cents.”

“Mill” stands for 1,000, and “Kilo” is another prefix for 1,000.