the 9th month of the year, between August and October 九月 She was born in September. 她出生于九月。 - (British English)
The meeting is on the fifth of September/September the fifth. 会议在九月五日/九月五日。 - (North American English)
The meeting is on September fifth. 会议在九月五日。 We went to Japan last September. 我们去年九月去了日本。 I arrived at the end of September. 我是九月底到的。 last September's election 去年九月的选举 the September issue of the magazine 该杂志的九月号
Word Originlate Old English, from Latin, from septem ‘seven’ (being originally the seventh month of the Roman year).