noun
favorable circumstances; prosperity
Refers to a situation where things are going well, often contrasted with 逆境 (adversity).
Antonyms: 逆境
順境の時こそ気を引き締めなければならない。
It is precisely when things are going well that you must stay on your toes.
彼は順境にあっても奢らなかった。
Even in favorable circumstances, he did not become arrogant.