Of or pertaining to the millennium, or to a thousand years; as, a millennial period; millennial happiness.
- Referring to the 1,000th anniversary of an event or happening: millennial fair.
- Occurring every thousand years
- Occurring at the end or beginning of a millennium
- Referring to the millennium: the millennial judgment.
- A person from the generation which grew up in the 90's and 2000's.