Définitions
1.AdjectiveThousand-year-old; also thousands of years old.
2.AdjectiveOccurring every thousand years.
3.AdjectiveOccurring at, or relating to, the beginning or end of a millennium.
4.AdjectiveReferring to the thousandth anniversary of an event or happening."a millennial fair"
5.AdjectiveOften capitalized: of or relating to, or characteristic of, people born in the last two decades of the 20th century from around the early 1980s to the mid 1990s (with 1996 births cited as the last Millennial year), and who reached adulthood early in the third millennium C.E."the millennial generation; He was suffering from a typical millennial problem: Which is the correct emoji to use?"
6.AdjectiveSynonym of millenarian (“pertaining to the belief in an impending period of one thousand years of peace and righteousness associated with the Second Coming of Christ and his reign on earth”)."the millennial judgment"
7.NounOften capitalized: a person from the generation born in the last two decades of the 20th century, from around the early 1980s to the mid-1990s and who reached adulthood early in the third millennium C.E., characterized by their familiarity with computer technology and poorer financial prospects than their parents.
8.NounA thousandth anniversary; also, a celebration of such an anniversary.