First Known Use: circa 1638
Dictionary
millennium
noun mil·len·ni·um \mə-ˈle-nē-əm\
: a period of 1,000 years
: a period of a thousand years counted from the beginning of the Christian era
plural -nia \-nē-ə\ or mil·len·niums
Full Definition of MILLENNIUM
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
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Origin of MILLENNIUM
New Latin, from Latin mille thousand + New Latin -ennium (as in biennium)
Other Calendar Terms
MILLENNIUMS Defined for Kids
millennium
noun mil·len·ni·um \mə-ˈle-nē-əm\
plural mil·len·nia \-nē-ə\ or millenniums
Definition of MILLENNIUM for Kids
1
: a period of 1000 years
2
: a 1000th anniversary or its celebration
— mil·len·ni·al \-nē-əl\ adjective
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