Etymology
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millennial (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 "a thousandth anniversary." From 1991 as a generational name for those born in the mid-1980s and thus coming of age around the year 2000.

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Definitions of millennial

millennial (adj.)
relating to a millennium or span of a thousand years;
Synonyms: millennian
From wordnet.princeton.edu