Relating to a period of ten months or occurring every ten months.
From Latin 'decem' (ten) plus 'mensis' (month), with Latin suffix '-ial.' An extremely rare and technical term found mainly in historical or specialized contexts.
This word is so obscure that it barely appears in English literature—it's the kind of word that might be used once in a medieval manuscript about astronomical cycles and then disappears into obscurity for centuries.
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