das Millennium
millennium
A period of one thousand years; a thousand-year span.
Die Burg wurde vor fast einem Millennium erbaut.
The castle was built almost a millennium ago.

millennium
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millennium
A period of one thousand years; a thousand-year span.
Die Burg wurde vor fast einem Millennium erbaut.
The castle was built almost a millennium ago.

The word 'Millennium' comes from Latin. It is made up of 'mille' (thousand) and 'annus' (year), so it literally means 'thousand-year'.
Die Menschheit steht an der Schwelle zu einem neuen Millennium.
Humanity stands on the threshold of a new millennium.
When a historical period of 1000 years is being discussed, the general meaning is intended. If the word refers to a celebration or event around the year 2000, it means the specific turn of the millennium.
Die Geschichte der Stadt reicht über ein Millennium zurück.
The history of the city goes back more than a millennium.
In connection with the turn of the year 1999/2000, the word is often used in fixed phrases: 'die Feier zum Millennium' (the millennium celebration), 'der Millenniumswechsel' (the turn of the millennium), or 'die Millenniums-Party' (the millennium party).
Die Party zum Millennium war unvergesslich.
The millennium party was unforgettable.
century
'das Jahrhundert' and 'das Millennium' both refer to long periods of time, but they are not the same size. A century lasts one hundred years; a millennium lasts one thousand years. So a millennium consists of ten centuries. Learners may confuse the words because both often appear in historical contexts. In addition, 'Millennium' can also specifically mean the transition into a new millennium, especially the change from 1999 to 2000. For one hundred years, you say 'Jahrhundert'; for one thousand years or the turn of the millennium, 'Millennium'.

Zum Millennium feierten viele Menschen den Beginn des Jahres 2000.
For the millennium, many people celebrated the beginning of the year 2000.
Viele Erfindungen des letzten Jahrhunderts benutzen wir noch heute.
We still use many inventions from the last century today.