December · noun C or U /dɪˈsem.bər/
December
A1 the twelfth and last month of the year
Dictionary examples:
the 23rd of December/December 23(rd)
Their baby was born last December.
Jonathan finishes his course next December.
My parents got married in/during December.
It was one of the coldest Decembers ever.
Learner example:
We can see it on December 15th. (Key English Test; A2; Portuguese)