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The Collaborative International Dictionary
Decennial

Decennial \De*cen"ni*al\, a. [See Decennary.] Consisting of ten years; happening every ten years; as, a decennial period; decennial games.
--Hallam.

Decennial

Decennial \De*cen"ni*al\, n. A tenth year or tenth anniversary. [1913 Webster] ||

Douglas Harper's Etymology Dictionary
decennial

1680s, from Latin decennium, from decennis "of 10 years," from decem "ten" (see ten) + annus "year" (see annual). For vowel change, see biennial.

Wiktionary
decennial

a. Occurring every ten years. n. The tenth anniversary of an event or happening.

Usage examples of "decennial".

And when I checked the news files, I found you were at the Decennial Convention earlier this year.

He must have seen me on holovision on the occasion of the Decennial Convention and he remembered the word 'psychohistory.

We've wanted you from the day you addressed the Decennial Convention and we are so glad to have you now.

He said angrily, “I will never live down that presentation at the Decennial Convention.

He must have seen me on holovision on the occasion of the Decennial Convention and he remembered the word ‘psychohistory.

We’ve wanted you from the day you addressed the Decennial Convention and we are so glad to have you now.

That is a source of amusement to those at the court who are not entirely my friends and it would not surprise anyone here that I should be concerned about laying the groundwork for the forthcoming Decennial Convention.

Did he not present a paper, some years ago, at the last Decennial Convention that interested us?

After all, it is not long before the Decennial Convention is upon us once more.

He had been thirty when the first hint of psychohistory had come to him, thirty-two when he delivered his famous lecture at the Decennial Convention, following which everything seemed to happen to him at once.

The Lord Leto's female legions have elected their representatives to attend the Decennial Festival on Arrakis.

Our Embassy to the Lord Leto's Decennial Festival will make a full report of this to him.

They had been in the God Emperor's audience chamber beneath Onn's central plaza at the time, with Moneo fatigued after a long day of directing the flow of dignitaries who crowded the city for Decennial festivities.

They were in the airy room of golden stone atop the Citadel's south tower, Leto's third full day back from the Decennial Festival in Onn.