December · noun C or U /dɪˈsem.bər/Full view
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)

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