noun, measure word, time word, punctuation, modal particle, particle, verb · a period of time based on the orbit of the moon, or one of the twelve divisions of a year

我在北京住了一个月。

noun · occurring, occurring, or payable every month

这套公寓的月租很便宜。

noun, idiom, verb, expression · the natural satellite of the Earth

中秋之夜，人们聚在一起赏月。