1N-COUNT 一千年;千年期 A millennium is a period of one thousand years, especially one which begins and ends with a year ending in '000', for example the period from the year 1000 to the year 2000. 一千年;千年期 [formal]
2N-SING 2000年;千禧年 Many people refer to the year 2000 as the Millennium . 2000年;千禧年
...the eve of the Millennium.
千禧年前夜
...the cost of Millennium celebrations and festivals.