The Collaborative International Dictionary
Decennaries
Decennary \De*cen"na*ry\, n.; pl. Decennaries. [L. decennium a period of ten years; decem ten + annus a year.]
A period of ten years.
(O. Eng. Law) A tithing consisting of ten neighboring families.
--Burrill.
Wiktionary
decennaries
n. (plural of decennary English)
Usage examples of "decennaries".
But I was a European, and I had not lived long enough in the country to acquire the absolute passivity of the Native, as some Europeans will do, who live for many decennaries in Africa.