| Noun | 1. | millenary - the 1000th anniversary (or the celebration of it) anniversary, day of remembrance - the date on which an event occurred in some previous year (or the celebration of it) |
| 2. | millenary - a span of 1000 years period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period" century - a period of 100 years | |
| 3. | millenary - a sum or aggregate of one thousand (especially one thousand years) | |
| Adj. | 1. | millenary - of or relating to the doctrine of the millennium |
| 2. | millenary - relating to or consisting of 1000 |