December Definition

dĭ-sĕmbər
noun
The twelfth and last month of the year, having 31 days: abbrev. Dec. or D.
Webster's New World
Synonyms:
pronoun

The twelfth and last month of the Gregorian calendar, following November and preceding the January of the following year. Abbreviation: Dec or Dec.

Wiktionary

Other Word Forms of December

Noun

Singular:
December
Plural:
decembers

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

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle English decembre, from Old French decembre, from Latin december (“tenth month”), from Latin decem (“ten”), from Proto-Indo-European *dekm, ten; December was the tenth month in the Roman calendar.

    From Wiktionary

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