Here you will find one or more explanations in English for the word Decennoval.
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Decennoval
Decennoval De*cen"no*val, Decennovary De*cen"no*va*ry, a.
[L. decem ten + novem nine.]
Pertaining to the number nineteen; of nineteen years. [R.]
--Holder.
Meaning of Decennoval from wikipedia