1.nounA demographic term for a person from the generation born from around the early 1980s to the mid 1990s or early 2000s; individuals who reached adulthood early in the 3rd millennium, C.E.
2.adjectiveReferring to the 1,000th anniversary of an event or happening.
"millennial fair"
3.adjectiveOccurring every thousand years.
4.adjectiveOccurring at the end or beginning of a millennium.
5.adjectiveOf or relating to people born in the last two decades of the 20th century.
"He was suffering from a typical millennial problem: Which is the correct emoji to use?"
6.adjectiveReferring to the millennium, the period of one thousand years during which Christ will reign on earth.