Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Modern Latin
Origin: Latin mille 'thousand' + annus 'year'

millennium

noun
     
Related topics: Measurement, Chronology
mil‧len‧ni‧um plural millennia [countable]
1 [countable]TMC a period of 1000 years:
people who have inhabited this land for millennia
2 [usually singular]TM the time when a new 1000-year period begins:
the beginning of a new millennium
events which took place at the turn of the last millennium
millennial adjective

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