December definition

dĭ-sĕmbər
The 12th month of the year in the Gregorian calendar.
noun
4
1
The twelfth and last month of the year, having 31 days: abbrev. Dec. or D.
noun
4
2
The twelfth and last month of the Gregorian calendar, following November and preceding the January of the following year. Abbreviation: Dec or Dec.
pronoun
0
2
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Other Word Forms

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