autumn
/ˈɔːtəm/noun
1- chiefly Brit. the season after summer and before winter, when crops and fruits are gathered and leaves fall, in the northern hemisphere from September to November and in the southern hemisphere from March to May〈主英〉秋季, 秋天（北半球为9-11月, 南半球为3-5月）：
the countryside is ablaze with colour in autumn
秋天乡间熠熠生彩
as modifier autumn leaves秋叶
figurative 〈喻〉he was in the autumn of his life.
他已到了迟暮之年。
1.1
- Astronomy the period from the autumn equinox to the winter solstice【天文】秋（从秋分到冬至）。
词源
late Middle English: from Old French autompne, or later directly from Latin autumnus.