Definition of millennium
plural millennia
play
\-nē-ə\
or millenniums
1 a
:the thousand years mentioned in Revelation (see revelation 3) 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
- In 2015 the city of Leipzig, Germany, celebrated its millennium.
