- millennium - a span of 1000 years
--1 is a kind of time period, period of time, period
--1 has part: century- millennium - (New Testament) in Revelations it is foretold that those faithful to Jesus will reign with Jesus over the earth for a thousand years; the meaning of these words have been much debated; some denominations (e.g. Jehovah's Witnesses) expect it to be a thousand years of justice and peace and happiness
--2 is a kind of doctrine, philosophy, philosophical system, school of thought, ism
- millennium - the 1000th anniversary (or the celebration of it)
--3 is a kind of anniversary, day of remembrance
- millennium - (New Testament) in Revelations it is foretold that those faithful to Jesus will reign with Jesus over the earth for a thousand years; the meaning of these words have been much debated; some denominations (e.g. Jehovah's Witnesses) expect it to be a thousand years of justice and peace and happiness