十二月的英语是December，它是名词。
December 英 [dɪˈsembə] 美 [diˈsɛmbər]
n. 十二月
常用短语
1. in December 在十二月
2. at the end of December 在十二月底
3. at the beginning of December 在十二月初
4. last December 去年十二月
5. next December 明年十二月
例句：
December was passing and there was still no news of him.
十二月就要过去了，仍没有他的消息。
This event is staged annually, in the last week of December.
该活动于每年十二月的最后一个星期举办。
Her birthday is on the fifth of December.
她的生日是十二月五号。
The matter came to a head in early December.
十二月初，事情到了紧要关头。