Millennium Wikipedia open wikipedia design. A millennium (plural: millennia) is a time period of one thousand (1000) years. The word millennium is derived from two Latin words mille (that means in English "thousand") and annum ("year"). vteMillennia 1st · 2nd · 3rd · 4th · 5th · 6th · 7th · 8th · 9th · 10th · 11th and beyond 11th BC and prior · 10th BC · 9th BC · 8th BC · 7th BC · 6th BC · 5th BC · 4th BC · 3rd BC · 2nd BC · 1st BC This short article can be made longer. You can help Wikipedia by adding to it. This page is based on a Wikipedia article written by contributors (read/edit).Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.