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Etymology tree
Proto-Indo-European *déḱm̥
Proto-Italic *dekəm
Latin decem
Latin December
Latin decemberbor.
Old French decembrebor.
Middle English December
English December
From Middle English December, Decembre, from Old French decembre, from Latin december (“tenth month”), from Latin decem (“ten”); + Latin -ber, from -bris, an adjectival suffix; December was the tenth month in the Roman calendar.
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