Deed; act; work; skill; performance. Depending on context it can also refer to the Buddhist concept of karma (the results of actions).
職人の業が光る細かい彫刻だった。
It was a finely carved piece that showcased the craftsman's skill.
彼の悪い業が巡り巡って、ついに問題が表面化した。
His bad deeds came back around and finally the problem surfaced.
あの手品は長年の修練による業の集大成だ。
That magic trick is the culmination of years of practice and skill.
日常の小さな業が積み重なって結果を作ることがある。
Small everyday actions can accumulate and produce results.