Refinement
Polish
noun, verbal noun
せんれん
練習 (れんしゅう) Practice, Training, Drill
訓練 (くんれん) Training, Practice
洗練 (せんれん) Refinement, Polish
研修 (けんしゅう) Training, Give Training
実践 (じっせん) Practice, Put Into Practice
Refinement is all about rinse and repeat. In Japanese it's wash and practice.