Decennium: meaning, definitions and examples

More formal or academic term, often used in historical or scholarly contexts to describe a ten-year period.

• The decennium from 1901 to 1910 saw many significant changes in society.
• We are studying the economic trends over the past decennium.

Commonly used in everyday conversation and writing to refer to a period of ten years.

• The 1990s was a memorable decade for pop music.
• She has been teaching at the university for over a decade.

Rarely used, more technical term, often found in legal or specialized documents to refer to a ten-year period.

• The policy has been reviewed in each decennary since its inception.
• This decennary report provides insights into the company's long-term progress.