de·cen·ni·al (d -s n  - l)adj. 1. Relating to or lasting for ten years. 2. Occurring every ten years. n. A tenth anniversary. [From Latin decennium, a period of ten years; see decennium.] de·cen ni·al·ly adv. |
decennial [dɪˈsɛnɪəl]
adj
1. (Mathematics & Measurements / Units) lasting for ten years
2. (Mathematics & Measurements / Units) occurring every ten years
n
a tenth anniversary or its celebration
decennially adv
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