Simple Definition of millennium
: a period of 1,000 years
: a period of a thousand years counted from the beginning of the Christian era
Full Definition of millennium
plural -nia \-nē-ə\ or mil·len·niums
1 a : the thousand years mentioned in Revelation 20 during which holiness is to prevail and Christ is to reign on earth b : a period of great happiness or human perfection
2 a : a period of 1000 years; especially : one reckoned from the beginning of the Christian era <at the start of the third millennium> b : a 1000th anniversary or its celebration
Examples of millennium
The book describes the changes that have occurred in the landscape over many millennia.
The year 2000 was celebrated as the beginning of the third millennium.
Origin of millennium
New Latin, from Latin mille thousand + New Latin -ennium (as in biennium)
First Known Use: circa 1638
MILLENNIUM Defined for Kids
Definition of millennium
plural mil·len·nia \-nē-ə\ or millenniums
1 : a period of 1000 years
2 : a 1000th anniversary or its celebration
Seen and Heard
What made you want to look up millennium? Please tell us where you read or heard it (including the quote, if possible).