To achieve complete success in one's spiritual cultivation; to attain perfection and enlightenment, often implying reaching a state of immortality or profound wisdom.
这位隐居多年的高僧，终于行满功圆，得证大道，获得了内心的平静与智慧。
After years of reclusive practice, this eminent monk finally achieved perfect enlightenment, realizing the Great Way, and gaining inner peace and wisdom.
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