in or relating to the time after you finish a degree or other course of study

He was not clear about his post-graduation plans. 他不清楚自己毕业后的计划。

For medical students in this country, the government remains the sole employer postgraduation. 对于这个国家的医学生来说，毕业后仍然只能为政府工作。

happening after the ceremony that shows you have finished a degree or other course of study

The students were not able to attend the post-graduation party. 这些学生没能参加毕业典礼后的派对。