millennium (n.)youdaoicibaDictYouDict
1630s, from Modern Latin millennium, from Latin mille "thousand" (see million) + annus "year" (see annual); formed on analogy of biennium, triennium, etc. For vowel change, see biennial. First in English in sense of "1,000-year period of Christ's anticipated rule on Earth" (Rev. xx:1-5). Sense of "any 1,000-year period" first recorded 1711. Meaning "the year 2000" attested from 1970.
terminer (n.)youdaoicibaDictYouDict
"a determining," legal term, from French terminer "to end," in Old French "to decide, rule on," from Latin terminare (see terminus; also see oyer).