Etymology of December

The word December comes from the Latin December (tenth month of the old Roman calendar, which began with March), from decem (ten), related to the Greek deca [ten; Gr: δέκα].

See also "etymology of dean" here .
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In modern Greek:
a) Decembrios (better pronounced as Dekemvrios): December [Gr: Δεκέμβριος]
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Etymology of cinnamon

Origin of the word cinnamon

The word cinnamon comes from the old French cinnamone from the Latin cinnamomum/cinnamum (cinnamon) [also used as a term of endearment], which is a transliteration of the Greek cinnamomon (cinnamon; Gr.: κιννάμωμον).

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OED

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