1season
2the last month of a season
3fourth or youngest amongst brothers
4classifier for seasonal crop yields
Examples
zài在dì第sān三jì季shí时xiāo shòu销售diē跌le了xià lai下来。
在第三季时销售跌了下来。
Sales fell off in the third quarter.
现在牡蛎当季吗？
Are oysters in season now?
我们公司今季的赤字上涨了差不多一成。
Our surplus has swelled by nearly ten percent in this quarter.