Definition of December
: the 12th month of the Gregorian calendar
Examples of december in a Sentence
Her birthday is in late December.
This December was not as cold as the past few Decembers have been.
DECEMBER Defined for English Language Learners
Definition of December for English Language Learners
: the 12th and last month of the year
Seen and Heard
What made you want to look up December? Please tell us where you read or heard it (including the quote, if possible).