decennary
NounOpen English WordNet
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onerousadjective
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Webster's Dictionary (1913)
De·cen′na·ry noun; pl. Decennaries (#).
Origin: L. decennium a period of ten years; decem ten + annus a year.
1. A period of ten years.
2. O. Eng. Law A tithing consisting of ten neighboring families. Alexander Mansfield. Burrill
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54