the 12th and last month of the year 十二月 She was born in December. 她是在12月出生的。 - (British English)
The meeting is on the fifth of December/December the fifth. 会议在12月5日举行。 - (North American English)
The meeting is on December fifth. 会议在12月5日。 We went to Japan last December. 去年12月我们去了日本。 I arrived at the end of December. 我是12月底到的。 last December's celebrations 去年12月的庆典 It was a cold December morning. 那是一个寒冷的十二月的早晨。
Word OriginMiddle English: from Latin, from decem ‘ten’ (being originally the tenth month of the Roman year).