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