December meaning

dĭ-sĕm'bər
The 12th month of the year in the Gregorian calendar.
noun
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The twelfth and last month of the year, having 31 days: abbrev. Dec. or D.
noun
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The twelfth and last month of the Gregorian calendar, following November and preceding the January of the following year. Abbreviation: Dec or Dec.
pronoun
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Origin of december

Middle English decembre from Old French from Latin December the tenth month of the Roman year probably from decemmembris from decem-mēnsris decem ten dekm̥ in Indo-European roots mēnsis month menses