Consisting of or relating to a thousand people, years, etc.; lasting or having lasted a thousand years, or (indefinitely) a very long time.

= triennial, adj. rare.

= Olympiadic adj.

= decennial, adj.

Of or pertaining to a period of ten years.

Of or belonging to thirty years.

Designating a period of 592 years.

of six thousand years (only in sexmillennial duration of the world).

= sexmillennial adj.

Consisting of or lasting for five years.

Of or relating to a millennium. Obsolete. rare.

= decennal, adj.

Thousand-year-old, or (indefinitely) thousands of years old; of a thousand years.

Consisting of nine years.

of or belonging to a chiliad or thousand years.

Of or pertaining to a period of ten years; decennial, adj. n.

Of or relating to a period of six hundred years; esp. commemorating a six-hundredth anniversary.

Of, relating to, or characteristic of a period in which one millennium ends and another begins, esp. to associated feelings of expectation or…

= tercentenary, adj. n.

= tercentennial, adj. n.

of or relating to an Olympiad or Olympiads (sense 1).

Of or belonging to the period following the year 1000 or (now more usually) 2000. Cf. millennium, n. 2.