Century

What Is Century?

A century is a unit of time that equals 100 years. People use centuries to talk about big stretches of time, such as major periods in history or slow changes in society and technology.

For example, the years 1901 to 2000 form the twentieth century, and the years 2001 to 2100 form the twenty first century.

Definition

Century means a period of 100 years.

Some key points:

• 1 century equals 100 years.
• Centuries are often used to sort history into neat blocks of time.
• Centuries are numbered, such as the fifteenth century or the twenty first century.
• In the common calendar, a century usually starts in a year that ends in 01 and ends in a year that ends in 00, such as 1901 to 2000.

So, if you live a full 100 years, you have lived for one century.

History / Origin

The word century comes from the Latin word centum, which means one hundred.

In ancient Rome:

• The word was linked to groups of 100, such as soldiers in the Roman army.
• Later, people also used the word to talk about groups of 100 years.

Over time, as calendars and history writing became more exact, using 100 year blocks became common for talking about the past. Historians and writers started to say things like “the seventeenth century” for the years in the 1600s, and this way of speaking spread widely.

Today, the idea of a century is strongly tied to the Gregorian calendar, which is the calendar system used by most of the world. In this system, centuries help mark big turning points such as the start of the year 1901 or 2001.

Symbol & Abbreviation

There is no single official scientific symbol for a century like there is for seconds or meters. But in writing, people sometimes use short forms.

Common informal abbreviations include:

• c. or cent. for century.
• c. in front of a year can also mean circa, which means “around this time,” so you must use context to understand the meaning.

In most school work and clear writing, it is better to write the full word century instead of using a short form, so that there is no confusion.

Current Use Around the World

The idea of a century is used in many ways in daily life, school, and culture.

1. In history and school

• Teachers and books use centuries to sort events, such as “technology in the twentieth century” or “art in the fifteenth century.”
• It helps students see which events happened near each other in time.

2. In everyday speech

• People say things like “a century ago” to mean “about 100 years ago.”
• Phrases like “turn of the century” describe the years when one century ends and the next one begins.

3. In sports

• In cricket, a century means a single batter scores 100 runs in one innings. This is a big achievement.
• In some sports, scoring 100 points or goals in a career can also be called a century, though this is less formal.

4. In planning and science

• Climate scientists may study changes over several centuries.
• City planners may look at how a town grew over one or two centuries.

Even though many cultures have different traditional calendars, the century as 100 years is widely understood because most countries use the same basic year count based on the Gregorian calendar.

Example Conversions

Here are some simple conversions to show how a century compares with other units of time.

Some worked examples:

• 3 centuries to years 3 × 100 equals 300 years.
• 450 years to centuries 450 divided by 100 equals 4.5 centuries.
• 0.25 century to years 0.25 × 100 equals 25 years.
• 1.5 centuries to decades 1.5 × 10 equals 15 decades.

Related Units

Centuries connect to other common time units that you may already know.

• Year the basic unit for most calendars. 1 century equals 100 years.
• Decade a group of 10 years. 1 century equals 10 decades.
• Millennium a group of 1000 years. 1 millennium equals 10 centuries.
• Month about one twelfth of a year. About 1200 months are in a century.
• Day 24 hours. Around 36,525 days are in a century, because of leap years.

When studying history, you will also see centuries named by number.

• First century years 1 to 100.
• Second century years 101 to 200.
• Twentieth century years 1901 to 2000.
• Twenty first century years 2001 to 2100.

FAQs

How many years are in a century

There are exactly 100 years in one century. This is true in all normal uses of the word century.

Why is the twentieth century the 1900s, not the 2000s

Centuries are counted starting from year 1, not year 0. The first century is years 1 to 100, the second is 101 to 200, and so on. So the years 1901 to 2000 are the twentieth century, and the years 2001 to 2100 are the twenty first century.

What century was the year 1999 in

The year 1999 is in the twentieth century, because it is between 1901 and 2000.

What century are we in now

The answer depends on the current year. For any year from 2001 to 2100, we are in the twenty first century.

Can a person live for a whole century

Yes, it is possible but rare. Someone who lives to age 100 or more has lived for one full century. People aged 100 or older are often called centenarians.

Is a century always about time

Most of the time, yes. However, in some sports like cricket, a century can also mean a score of 100 runs by a single batter. In everyday life, though, century almost always means 100 years.

What does “turn of the century” mean

“Turn of the century” means the short period when one century ends and the next one begins, for example the years around 1900 to 1901 or 2000 to 2001.

How do you quickly change years to centuries

To change years to centuries, divide the number of years by 100. For example, 350 years is 3.5 centuries, and 50 years is 0.5 century.