Century vs Era

When to use each in English, with meaning, register, and examples.

Century

Top 1,000 (very common) A1 noun

Era

Top 2,000 (common) B2 noun

Most common: Century

	Century	Era
Pronunciation	🇬🇧 //ˈsɛnʧəri// 🇺🇸 //ˈsɛnʧəri//	🇬🇧 /["/ˈɪərə/"]/ 🇺🇸 /["/ˈɪrə//ˈerə/"]/
Meaning	A period of 100 years.	A long period of time with special events or features.
Example	The 21st century started in the year 2001.	The Victorian era was marked by significant cultural and industrial change.
Register	Neutral	Neutral
How common	Top 1,000 (very common)	Top 2,000 (common)
CEFR level	A1	B2
Part of speech	noun	noun
Collocations	21st century, mid-century, turn of the century	golden, great, new, herald, mark, usher in, begin, end, during an/​the era, in an/​the era, into era, the beginning of an era, the dawn of an era, the dawning of an era
Antonyms	moment, instant	moment, instant
Common mistakes	Confused with 'decade', which means 10 years., Using 'centuries' incorrectly as a singular noun.	Confused with 'error' — they sound similar but have different meanings., Using 'era' for short-term events rather than long periods., Mixing up 'era' with 'area' in writing or speech.
Usage notes	Use 'century' when discussing historical periods or time. Avoid using it in casual contexts unrelated to time.	Use 'era' when describing significant periods in history, culture, or personal life. Avoid using it for shorter time frames which might be referred to as 'period' or 'stage'.

See it in real clips

House Of Dragons › S1 E1

As the first century of the Targaryen dynasty came to a close,

Century

Frequently asked questions: Century vs Era

What's the difference between Century and Era?

Century: A period of 100 years. Era: A long period of time with special events or features.

Which is more common: Century and Era?

Century is the most common in everyday English.

Which is more advanced: Century and Era?

Era is the highest level, at B2, on the CEFR scale.

Are Century and Era the same CEFR level?

Century: A1, Era: B2 on the CEFR scale.

What part of speech are Century and Era?

Century: noun, Era: noun.

Can you show an example of each?

Century: The 21st century started in the year 2001. Era: The Victorian era was marked by significant cultural and industrial change.

Can I use Century and Era interchangeably?

Not always. Century and Era are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.