a. 十年间的, 每十年一次的, 持续十年的

n. 十周年, 十周年纪念

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


Decennial \De*cen"ni*al\, n.
A tenth year or tenth anniversary.
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