Definitions

1. noun

a period of 1,000 years, especially in the Christian era, reckoned from the birth of Jesus Christ.

“The current millennium began on January 1, 2001.”

2. noun

a period of 1,000 years, especially in a specific era or system of time reckoning.

“The Sumerians used a sexagesimal system that had 3,600 years in a millennium.”

3. noun

a large number or great quantity of something, especially something that is impressive or remarkable.

“The country experienced a millennium of peace and prosperity before the war.”

4. noun

the 1,000th anniversary of an event, especially the anniversary of a country’s founding or a major historical event.

“The millennium celebration marked the 1,000th anniversary of the city’s founding.”