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millennium
undermine

mil·len·ni·um

millennium

 
 
pronunciation:
m le ni m
features:
Word Explorer, Word Parts
part of speech: noun
inflections: millennia, millenniums
definition: a unit of time equal to one thousand years.
The previous millennium began with the year 1900.
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The word millennium contains the following part:
mill, milli, -illion Latin root that means thousand