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
2012, June 26, Genevieve Koski, Music: Reviews: Justin Bieber: Believe, When the staccato, Neptunes-ian single “Boyfriend†was released in March, musical prognosticators were quick to peg the album it portended, Believe, as Justin Bieber’s Justified, a grown-and-sexy, R&B-centric departure that evolved millennial teenybopper Justin Timberlake into one of the unifying pop-music figures of the aughts.
(Christianity) Referring to the millennium: the millennial judgment.