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semi-millenary
semi-millenary adj. 
/ˌsɛmɪˈmɪlᵻnəri/, /ˌsɛmiˈmɪləˌnɛri/ lasting 500 years.
Brit. /ˌsɛmɪmᵻˈlɛnəri/
, /ˌsɛmɪmᵻˈlɛnəri//ˌsɛmɪˈmɪlᵻnəri/U.S. /ˌsɛˌmaɪˈmɪləˌnɛri/
, /ˌsɛˌmaɪˈmɪləˌnɛri//ˌsɛmiˈmɪləˌnɛri/ΘΚΠ
the world > time > period > year > [adjective] > lasting for several years > that lasts a specific number of years
seven yeara1393
quinquenniala1475
triennial1641
septennary1644
biennial1645
septenarian1647
septennial1648
diennial1656
quadrennial1656
trienniated1661
quintennial1687
semi-millenary1728
1728 M. Earbery in tr. T. Burnet Of State of Dead II. ix. 24 A long millenary, or semi-millenary Life.
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as lemmas
- neotraditional
- neotraditionalism
- neotraditionalist
- neotriassic
- neotropic
- neotropical
- neotropics
- neotsum
- neottious
- neotudor
- neotype
- neotypes
- neoutilitarianism
- neovascularization
- neovictorian
- neovitalism
- neovitalist
- neovitalistic
- neovolcanic
- neoza
- neoza pine
- neozoic
- neozoological
- neozoologist
- neozoology