- of or relating to a millennium or the millennium.
- worthy or suggestive of the millennium.
- (often initial capital letter) noting or relating to the generation born in the 1980s or 1990s, especially in the U.S.
- (often initial capital letter) a person born in the 1980s or 1990s, especially in the U.S.; a member of Generation Y: Millennials are facing a deep economic crisis.
adj.1660s, “pertaining to the millennium,” from stem of millennium + -al (1). Meaning “pertaining to a period of 1,000 years” is from 1807. As a noun from 1896, originally “thousandth anniversary.” From 1992 as a generational name for those born in the mid-1980s and thus coming of age around the year 2000.