Origin: ME & OFr Decembre < L December < decem, ten (+ -ber < ?): so named as the tenth month of the ancient Roman year, which began with March
See December in American Heritage Dictionary 4
noun Abbr. Dec.
Origin: Middle English decembre
Origin: , from Old French
Origin: , from Latin December, the tenth month of the Roman year
Origin: , probably from *decemmembris
Origin: , from *decem-mēnsris
Origin: : decem, ten; see dekm̥ in Indo-European roots
Origin: + mēnsis, month; see menses.
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